quiz 3 retake

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

• nucleus 
• electron cloud
• core 
• center 

Tags

NGSS.MS-PS1-1

If the mass number of this chlorine atom is 36, how many neutrons does it have?

• 17

• 18

• 19

• can't be determined

Tags

NGSS.MS-PS1-1

Two atoms of the same element but with different mass numbers are called________

• electrons
• isotopes
• variables
• electron cloud

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

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 number in Kr-84 represents what about Krypton?

• The number of electrons

• The number of protons

• The mass number

How many neutrons does the isotope of lithium - 8 have?

• 8

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Tags

NGSS.MS-PS1-1

How many neutrons are in the following atom?

• 47

• 61

• 108

• 155

Tags

NGSS.MS-PS1-1

How many protons are in the following atom?

• 82

• 125

• 207

• 189

Tags

NGSS.MS-PS1-1