1a2 Quick Check (Counting Subatomic Particles)

What property determines if an atom is identified as Flourine?

• it has 10 neutrons

• it has an atomic mass of 19

• it has 9 protons

• Its element symbol is Fl.

What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

Tags

NGSS.MS-PS1-1

Sodium has an atomic number of 11. How many protons does each sodium atom have?

• 33

• 22

• 11

• 0

Which of these statements is INCORRECT?

• The number of protons determines the atomic number.

• The atomic number and number of protons are the same.

• An atomic number of 5 means there are 5 protons.

• The number of neutrons is always the same as the number of protons.

What is the mass number of an atom that contains 9 protons, 10 neutrons, and 9 electrons?

• 9

• 10

• 18

• 19

A phosphorus atom has 15 protons. It has a mass number of 31. How many neutrons does it have?

• 15

• 16

• 31

• 6

Tags

NGSS.MS-PS1-1

How many protons are in a Chlorine atom?

• 17

• 35

• 35.45

• 18

Tags

NGSS.MS-PS1-1

How many electrons are in a Chlorine atom?

• 17

• 35

• 35.45

• 18

Tags

NGSS.MS-PS1-1

How many neutrons are in an average Chlorine atom?

• 17

• 35

• 35.45

• 18

Tags

NGSS.MS-PS1-1

What is the atomic mass of Neon?

• 10
• 20

• 15

• 30

Tags

NGSS.HS-PS1-1