1. _____The number of protons in the nucleus of the atom is called                      Name___________________________

A. mass number   B. atomic number     C. atomic mass    D. atomic weight          Atomic structure quiz 1

 

2. _____The number of protons plus the number of neutrons in the nucleus is the

A. mass number   B. atomic number     C. atomic mass    D. atomic weight

 

True or False: All about protons

3. ___T__ A proton has the same mass as a neutron, 1 atomic mass unit.

4. ___T__A proton has a positive charge.

5. ___F__A proton and an electron have the same mass but opposite charge. (much different mass)

6. ___T__ Protons are found in the nucleus of the atom.

 

Use your periodic table to help you fill in the following chart:

 

   Symbol

Atomic number

Mass number

Number of protons

Number of electrons

Number of neutrons

7

Ca

  20

 40

 20

 20

20

8

Cl

  17

 35

 17

 17

18

9

Na

  11

 23

 11

 11

12

10

Ca2+

  20

 40

 20

 18

20

11

Cl -

  17

 35

 17

 18

18

12

Na+

  11

 23

 11

 10

12

 

13. Write down the symbols of any cations in the table above: __ Ca2+___ Na+________________

 

14. Write down the symbols of any anions in the table above: ________ Cl -______________

 

15. Write down the symbols of the electrically neutral (or uncharged) atoms in the table above. ___ Ca ____ Cl ____ Na

 

16-19 Draw models for He, Li+, Ar, and Ca2+ on back of this sheet or on the answer sheet provided__

 He= 2p, 2n in nucleus and 2 electrons in first shell

Li+ = 3p, 4n in nucleus and 2 electrons in first shell (electrons are just like He electrons)

Ar = 18 protons and 22 neutrons in nucleus, 2 electrons in first shell, 8 in second shell, 8 in third shell

Ca2+= 20 protons and 20 neutrons in nucleus, 2 electrons in first shell, 8 in second, 8 in third (electrons are just like Ar)