Atom Models - Protons & Electrons

What type of atom model is shown?

• Bohr Model of the atom

• Electron Cloud Model of the atom

Tags

NGSS.MS-PS1-1

What type of atom model is shown?

• Bohr Model of the atom

• Electron Cloud Model of the atom

Tags

NGSS.MS-PS1-1

What is the number of protons in the Bohr Model Shown?

• 2

• 5

• 7

• 14

Answer explanation

Nitrogen has an atomic number of 7.

This tells you that the number of protons is 7.

Tags

NGSS.MS-PS1-1

How many protons should be placed in the nucleus of the Bohr Model shown?

• 2

• 4

• 6

• 8

Answer explanation

There are 6 electrons.

The number of protons must equal the number of electrons, so there are also 6 protons in the nucleus.

Tags

NGSS.MS-PS1-1

How many electrons should be located on the 3rd energy level of this Bohr Model of Argon (Ar)?

• 6

• 2

• 8

• 18

Answer explanation

It has 18 electrons.

The 1st has 2, the 2nd has 8 - which adds up to 10.

It needs 8 more.

Tags

NGSS.MS-PS1-1

Silicon (Si) has an atomic number of 14.

How many electrons would be placed on each energy level?

• 1st - 2

  2nd - 8

  3rd - 4

• 1st - 4

  2nd - 8

  3rd - 2

• 1st - 2

  2nd - 6

  3rd - 6

• 1st - 2

  2nd - 8

  3rd - 8

Tags

NGSS.MS-PS1-1

Fluorine (F) has 9 protons.

How many electrons would be placed on the 2nd energy level to complete the Bohr Model of fluorine?

• 9

• 2

• 8

• 7

Answer explanation

9 protons = 9 electrons

The 1st energy level has 2 electrons.

9 - 2 = 7

So, 7 electrons will go on the 2nd level.

Tags

NGSS.MS-PS1-1

How many electrons should be located on the 2nd energy level of this Bohr Model of Aluminum (Al)?

It has an atomic number of 13.

• 2

• 3

• 8

• 13

Answer explanation

Aluminum has 13 protons and 13 electrons.

The 1st energy level has 2 electrons, the 3rd energy level has 3 electrons. 2 + 3 = 5

It needs 13 in all, so 13 - 5 = 8.

Plus, all energy levels must be filled before filling an outer level; therefore, it must have all 8 to be full.

Tags

NGSS.MS-PS1-1

An atom of sodium (Na) has an atomic number of 11.

How many protons does sodium have?

• 2

• 8

• 11

• 1

Answer explanation

The atomic number tells you how many protons there are.

An atomic number of 11 means there are 11 protons.

Tags

NGSS.MS-PS1-1

An atom of lithium has an atomic number of 3.

How many electrons does it have?

• 1

• 2

• 3

Answer explanation

The atomic number of 3 tells you there are 3 protons.

The number of protons equals the number of electrons, so there are also 3 electrons.