Atoms & Periodic Table Review

Question 1

The mass weight/number minus the atomic # of an element tells us the number of ___ an atom has.

Accepted Answer

neutrons

Question 2

Argon (Ar) is in period 3 and group 18. In a normal Argon atom, how many valence electrons?

Accepted Answer

8

Question 3

Where are metals found in the periodic table?

Accepted Answer

in the center and to the left

Question 4

What do the following elements have in common Helium (He), Neon (Ne), and Argon (Ar)?

Accepted Answer

They are noble gases.

Question 5

All of the following are elements found on the periodic table EXCEPT:

Accepted Answer

CO

Question 6

Potassium has an atomic number of 19 and its mass is 39. How many protons does the atom have?

Accepted Answer

19

Question 7

Groups or families on the periodic table tell us the number of valence electrons?

Accepted Answer

True

Question 8

Periods have similar chemical characteristics on the periodic table?

Accepted Answer

False

Question 9

Potassium has an atomic number of 19 and its mass is 39. How many neutrons does the atom have?

Accepted Answer

20

Question 10

Argon (Ar) is in period 3 and group 18. In a normal Argon atom, how many energy levels?

Accepted Answer

3

Questions 10