Electron Shells

What does this symbol stand for?

Tags

NGSS.MS-PS2-3

An element has an electron configuration of 2,8. Which element is this?

The electron configuration of lithium is 2,1. Which shells do the electrons occupy?

• L, M

• N, O

• K, L

• K, L, M

How many protons does Magnesium have?

• 24

• 12

• 2

• 16

Tags

NGSS.MS-PS1-1

The electron configuration of oxygen is 2, 6. What is its atomic number?

• 2

• 6

• 8

• 4

Tags

NGSS.MS-PS1-1

• 2
• 8
• 3
• 13

Tags

NGSS.MS-PS1-1

What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

• 2
• 3
• 5

Tags

NGSS.MS-PS1-1

How many electrons go in the first shell (ring) ?

• 6

• 8

• 4

• 2

How many valence electrons?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1