1. How are the elements arranged in the periodic table?

a) By their density
b) By their melting and boiling points
c) By their reactivity
d) By their atomic number

2. Elements in the same group of the periodic table react in a similar way because they have the same number of in their outer shell or energy level.

3. What is the maximum number of electrons the first electron shell or energy level can hold?

a) 2
b) 8
c) 18
d) 32

4. In GCSE chemistry and science what is the maximum number of electrons the third electron shell or energy level can hold?

a) 2
b) 8
c) 18
d) 32

5. The number of in the outer shell or energy level will determine how an element reacts chemically.

6. The vertical columns in the periodic table are called and the horizontal rows in the periodic table are called .

7. What is the common name given to the outermost electron shell?

a) Shielded shell
b) Inner shell
c) Nuclear shell
d) Valency shell

8. The element carbon is found in group 4 of the periodic table, how many electrons does it have in its outer electron shell?

a) 4
b) 12
c) 2
d) 18

9. The first electron shell can hold a maximum of 2 electrons while the second electron shell can hold a maximum of electrons.

10. Phosphorus has an atomic number of 15. What is its electron arrangement?

a) 2, 8, 18.
b) 2, 8, 7.
c) 2, 8, 5.
d) 2, 7, 8.

10. Potassium has an atomic number of 19 and is found in group 1 of the periodic table, what is its electron arrangement?

a) 2, 8, 1
b) 2, 8, 8, 1
c) 2, 8, 8, 8, 1
d) 2, 1