Electron configuration basics and emission spectra

State the maximum number of electrons that can be placed in the first electron shell of an atom.

• 1

• 2

• 6

• 8

State the maximum number of electrons that can be placed in the second electron shell of an atom.

• 2

• 8

• 16

• 24

State the maximum number of electrons that can be placed in the third electron shell of an atom.

• 2

• 14

• 16

• 8

A chlorine atom has 17 electrons. Its electron configuration must be:

• 2. 8. 7

• 10. 7

• 3. 7. 7

• 8. 2. 7

Tags

NGSS.MS-PS1-1

The electron arrangement of a calcium atom can be written as 2. 8. 8. 2. What must be the atomic number of calcium?

• 40

• 20

• 2

• 18

Tags

NGSS.MS-PS1-1

The electron arrangement of a calcium atom can be written as 2. 8. 8. 2. How many valence electrons are there in a calcium atom?

• 2

• 8

• 20

• 18

This diagram shows the electron arrangement of a sulfur atom. How many protons must be there in a sulfur atom?

• 2

• 8

• 18

• 16

Tags

NGSS.MS-PS1-1

A sulfur atom has 16 neutrons in its nucleus and its electron arrangement is shown in the diagram. What would be the atomic mass of sulfur?

• 16

• 2

• 8

• 32

Tags

NGSS.MS-PS1-1

Write down the electron arrangement for an oxygen atom (₈O)

Tags

NGSS.MS-PS1-1

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

Tags

NGSS.MS-PS1-1