Atom Model

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

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 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

Which subatomic particle determines what the element is?

• proton

• neutron

• electron

Which subatomic particle has a neutral charge (no charge)?

• proton

• neutron

• electron

Oxygen (O) has an atomic number of 8. It has 8 protons and 8 electrons. How many electrons will be place on each of its energy levels?

• 1st - 3

  2nd - 5

• 1st - 8

  2nd - 8

• 1st - 6

  2nd - 2

• 1st - 2

  2nd - 6

Answer explanation

1st energy level can only hold 2.

2nd energy level can hold up to 8, but oxygen only has 8 electrons in all, so the 2nd energy level will only hold 6.

1st level 2 + 2nd level 6 = 8 in all

Tags

NGSS.MS-PS1-1

Which subatomic particle has a negative charge?

• proton

• neutron

• electron

Which subatomic particle has a positive charge?

• proton

• neutron

• electron

What is an electron?

• A positive part of the atom

• A big negative sphere inside the atom

• A small negative part of the atom

• A small positive part of the atom

Which of these experiments supported the idea of electrons?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1