WCR W5

Question 1 (1 mark)

The periodic table arranges all of the elements in order of increasing:

•  reactivity

•  atomic number

•  abundance

•  mass number

Question 2 (1 mark)

Argon has an atomic number of 18. Identify how many electrons a neutral argon atom possesses. 

•  8

•  9

•  18

•  36

Question 3 (1 mark)

When adding electrons to build an electron configuration:

(Select all that apply)

•  start from the inner shell and work outwards

•  start from the outer shell and work inwards

•  fill a shell before adding electrons to the next one

• half-fill a shell before adding electrons to the next one

Question 4 (1 mark)

What is the maximum number of electrons in the second shell of an atom. 

•  2

•  4

•  6

•  8

Question 5 (1 mark)

An atom's valence electrons:

•  are located closest to the nucleus

•  determine how stable it is

•  are related to the element's group in the periodic table

•  are in the atom's outer shell

Question 6 (1 mark)

The electron configuration of chlorine is 2.8.7. How many valence electrons does it have? 

•  0

•  2

•  7

•  8

Question 7 (1 mark)

Where on the periodic table would you find the element with the electron configuration 2.8.2? 

•  Period 2, Group 2

•  Period 2, Group 3

•  Period 3, Group 2

•  Period 3, Group 8

Question 8 (1 mark)

Elements in the same group of the periodic table have:

(Select all that apply)

•  the same number of valence electrons (except helium)

•  the same number of protons

•  similar properties

•  the same number of shells containing electrons

Question 9 (1 mark)

Select the statement that explains why the noble gases, in Group 18 of the periodic table, don't form ions. 

•  They have full valence shells

•  They have the same number of neutrons

•  They have half-filled valence shells

•  They have empty valence shells