Atoms and the Periodic Table

How many protons does nitrogen contain?

• 14.007

• 7

• 14

• 3.5

How many neutrons does a fluorine-19 atom contain?

• 9

• 19

• 18.9984

• 10

Tags

NGSS.MS-PS1-1

all elements are made of what 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

The atomic number is the number of ?

• neutrons

• protons

• electrons

• protons and neutrons

How many valence electrons?

• 2

• 8

• 3

• 13

Tags

NGSS.HS-PS1-1

Which subatomic particles contribute the most to the mass of an atom?

• Protons and Neutrons

• Protons only

• Electrons only

• Neutrons only

• Neutrons and electrons

Tags

NGSS.MS-PS1-1

The central region of an atom where its neutrons and protons are is called the

• nucleus 
• electron cloud
• core 
• center 

If an atom has 12 protons, how many electrons will it have?

• 12

• 24

• 6

• half as many

What is the atomic number of this atom?

• 11

• 12

• 10

• can't be determined

Tags

NGSS.MS-PS1-1

What is the mass number?

• 11

• 12

• 23

• 21

Tags

NGSS.MS-PS1-1