Atomic Number and Mass

Atomic Number is denoted by the symbol

• L

• A

• M

• Z

Atomic Mass Number is denoted by the symbol

• p

• n

• A

• e

How many Neutrons are present in the Sodium atom ?

• 12

• 11

• 0

• 23

Tags

NGSS.MS-PS1-1

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

The mass of one proton is greater than the mass of one...

• neutron

• electron

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom?

• 2

• 4

• 6

• none of the above

Tags

NGSS.MS-PS1-1

What is the formula to solve for the neutron?

• Mass + Atomic Number= Neutrons

• Mass x Atomic Number = Neutrons

• Mass - Atomic Number = Neutrons

• Mass + Number of Protons = Neutron

Tags

NGSS.MS-PS1-1

How many neutrons does the an element with an atomic number of 3 and a mass of 6.9 contain?

• 6.9

• 4

• 3

• 7

Tags

NGSS.MS-PS1-1

How many neutrons does oxygen have?

• 16

• 15.99

• 8

• Doesn't contain any neutrons

Can you round the atomic mass?

• Yes, always round the mass

• No, never round the mass

• Depends on which element

• Only round if the number increases