Junior Cert Science - Chemistry

"Sub-atomic particle" is the name given to
1. the tiny particles found inside the nucleus.
2. the tiny particles found inside an atom.
3. particles found in a nuclear submarine.
4. the tiny particles found outside the nucleus.
If an atom could be magnified to the size of a sports stadium, then its nucleus would have an approximate size equal to which of the following:
1. Twice the size of the stadium.
2. Half the size of the stadium.
3. A large elephant at the centre of the playing area.
4. A pea at the centre of the playing area.
Which of the following statements is false?
1. There are more than 100 different types of atom known.
2. An atom is the smallest part of an element that can exist on its own.
3. An element consists of more than one type of atom.
4. Not all elements can be found naturally on earth.
The masses of sub-atomic particles are usually measured in
1. atomic mass units.
2. kilograms.
3. grams.
4. ounces.
Which one of the following does not belong in an atom?
1. Neutron.
2. Proton.
3. Electron.
4. Nylon.
Where are the electrons located in an atom?
1. Orbitting around the nucleus.
2. Inside the nucleus.
3. Attached to the neutrons.
4. Attached to the protons.
The idea of electrons orbitting around the nucleus in fixed paths called shells or orbits was first proposed by
1. the Danish scientist Niels Bohr.
2. Albert Einstein.
3. the Greek philosopher called Democritus.
4. Springfield's Bart Simpson.
The region around the nucleus in which an electron may be found is often referred to as
1. an electron cloud.
2. an electron gun.
3. a molecule.
4. a group.
What is the charge on an electron?
1. Minus one.
2. Plus one.
3. No charge.
4. Minus two.
The diagram on the right shows the structure of an atom. What are the parts labelled A and B?
1. A = electron, B = nucleus.
2. A = nucleus, B = electron.
3. A = proton, B = nucleus.
4. A = neutron, B = proton.
Which particles are to be found in the nucleus of an atom?
1. Neutrons and protons.
2. Neutrons only.
3. Electrons and neutrons.
4. Protons, neutrons and electrons.
Which of the following pairs of properties is correct for the proton?
1. Its got a charge of -1 and normally found inside the nucleus of an atom.
2. Its got no charge and normally found inside the nucleus.
3. Its got a charge of +1 and normally found outside the nucleus.
4. Its got a charge of +1 and normally found inside the nucleus.
Which one of the following is the chemical symbol for nitrogen?
1. Ne
2. K
3. N
4. Nit
The chemical symbol "Ca" represents which of the following elements?
1. Carbon.
2. Sulfur.
3. Calcium.
4. Copper.
The element potassium is represented by which of the following symbols?
1. K
2. P
3. Po
4. Na
Which of the following statements is/are correct? (a) Protons have a charge of -1. (b) Neutrons have no charge. (c) An electron has negligible mass compared to the mass of a neutron.
1. Statements b) and c).
2. Statements a) and c).
3. Statement b) only.
4. Statement c) only.
What information does the Atomic Number of an element give us?
1. The name of the element.
2. The number of neutrons in the nucleus.
3. Whether an element has isotopes or not.
4. The year that the element was discovered.
What information does the atomic number of an element tell you?
1. The number of protons that it has in its nucleus.
2. The number of electrons in its nucleus.
3. The number of protons and neutrons in its nucleus.
4. The number of electrons and neutrons in its nucleus.
An atom contains 9 protons, 10 neutrons and 9 electrons. What is its atomic number?
1. 9
2. 10
3. 19
4. 28
What is the atomic number of magnesium (chemical symbol: Mg)? You may refer to your Periodic Table.
1. 12
2. 24
3. 24.32
4. 32
The combined number of protons and neutrons in the nucleus of an atom is called its
1. prime number.
2. atomic number.
3. mass number.
4. atomic mass unit.
What is the mass number of an atom that has 3 protons and 4 neutrons?
1. 3
2. 4
3. 7
4. 10
How many neutrons does the element of atomic number 1 and mass number 1 have?
1. 1
2. 0
3. 2
4. None of other mentioned values.
An atom contains 11 protons and 12 neutrons in its nucleus. Which of the following statements is/are correct? (i) This atom has an atomic number of 12. (ii) Its mass number is 23. (iii) This atom has 12 electrons.
1. Statement i) only.
2. Statement ii) only.
3. Statements ii) and iii).
4. Statements i) and iii).
Which one of the following statements is correct?
1. Number of neutrons = mass number - atomic number.
2. Number of neutrons = atomic number - mass number.
3. Number of protons = mass number - atomic number.
4. Number of electrons = atomic number - mass number.
Which one of the following sets of properties is correct for a proton?
1. Positively charged and found in the nucleus.
2. Negatively charged and found in the nucleus.
3. Positively charged and found outside the nucleus.
4. No charge and found outside the nucleus.
If an atom has an atomic number of 19 and a mass number of 39, then how many electrons has it got orbitting around its nucleus?
1. 19
2. 20
3. 39
4. 58
The period in which an element is located gives us
1. the number of electron shells that the electron has.
2. the number of electrons in its outer shell.
3. the electronic configuration of that element.
4. the number of neutrons in that element.
Which one of the elements shown in the periodic table below has a full outer shell of electrons?
1. Na
2. Ne
3. P
4. C
Which element has the electronic arrangement shown?
1. Chlorine.
2. Nitrogen.
3. Fluorine.
4. Neon.
Which one of the following is the electronic configuration for a group VII (7) element?
1. 2,8,7
2. 7,2
3. 2,5
4. 2,4
The element whose electronic structure is 2,8,6 belongs to which group of the periodic table?
1. II (2)
2. IV (4)
3. VI (6)
4. VIII (8)
Name the element that has an electronic structure of 2,4
1. Carbon.
2. Beryllium.
3. Oxygen.
4. Calcium.
An atom of nitrogen has 7 protons and 7 neutrons in its nucleus. What is its electronic structure?
1. 2,5
2. 2,7
3. 2,8,4
4. 5,2
Which one of the following is the correct symbol for gold?
1. Au
2. AU
3. au
4. aU
Nitrogen is in group V (5) of the periodic table. How many electrons are there in its outer shell?
1. 5
2. 7
3. 14
4. 21
Which of the elements shown in the periodic table has 2 electrons in its outer shell?
1. Nitrogen
2. Calcium
3. Boron
4. Chlorine
The number of protons found in an atom is called its
1. mass number.
2. atomic number.
3. prime number.
4. group number.
How many protons are there in an atom of sodium which has an atomic number of 11 and a mass number of 23?
1. 11
2. 12
3. 23
4. 34
If an element has an atomic number of 7 and a mass number of 14, what is the name of this element?
1. Neon.
2. Silicon.
3. Lithium.
4. Nitrogen.
What is the atomic number of an atom that has 5 protons, 6 neutrons and 5 electrons?
1. 5
2. 6
3. 11
4. 16
What is meant by the mass number of an element?
1. The number of protons in the nucleus.
2. The number of electrons in the atom.
3. The total number of protons and neutrons in the nucleus.
4. The number of neutrons in the nucleus.
An atom has an atomic number of 11 and a mass number of 23. How many neutrons has it got?
1. 11
2. 12
3. 23
4. 34
If an element has an atomic number of 9 and a mass number of 19, then, which of the following statements is INCORRECT?
1. Its got 10 electrons and 9 neutrons.
2. There are 10 neutrons in its nucleus.
3. Its got 9 protons and 9 electrons.
4. There are 9 electrons orbitting around its nucleus.
An atom of aluminium has
1. 13 protons, 14 neutrons and 13 electrons.
2. 13 protons, 13 neutrons and 14 electrons.
3. 14 protons, 13 neutrons and 13 electrons.
4. 13 protons, 13 neutrons and 27 electrons.
How many protons are there in the neutral atom shown on the right?
1. 9
2. 7
3. 2
4. 14
Which of the elements below will have the same number of electrons in its outer shell as the atom shown?
1. Potassium.
2. Aluminium.
3. Chlorine.
4. Carbon.
To which period does the element with the electronic configuration 2,8,7 belong?
1. Third.
2. First.
3. Second.
4. Fourth.
Which of the elements in the Periodic Table shown has 3 electrons in its outer shell?
1. B
2. Li
3. O
4. Ar
Name the element which has the electronic configuration shown.
1. Helium.
2. Aluminium.
3. Neon.
4. Calcium.
Which of the following electronic structures is that of an element in group VII (7)?
1. 2,5
2. 2,1
3. 2,8,5
4. 2,7
The diagram shows the electronic arrangement for aluminium, a group III (3) element. Which of the following electronic structures is that for an atom in group III of the Periodic Table?
1. 2,8,7
2. 2,3
3. 2,1
4. 2,8,5
What is the electronic structure of the phosphorous atom which has 15 electrons?
1. 2,8,5
2. 2,8,3
3. 2,13
4. 2,8,2,3
The electronic structure 2,5 is for which of the following elements?
1. Nitrogen.
2. Helium.
3. Phosphorous.
4. Boron.
Calcium is in group II (2) of the Periodic Table. How many electrons does it have in its outer shell?
1. 2
2. 4
3. 20
4. 11
To which period and group does the element with electronic configuration 2,8,8,2 belong?
1. Fourth period and second group.
2. Second period and fourth group.
3. Second period and eighth group.
4. Eighth period and second group.
Which one of the following is the chemical symbol for aluminium?
1. AL
2. Al
3. A2
4. al

Junior Cert Science - Chemistry - Atomic Structure

Multiple Choice Quiz