Chem II Unit 1 Review

How many valence (outer) electrons does an Oxygen atom have?

• 2

• 6

• 8

• 16

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Name this element.

• Neon

• Magnesium

• Sodium

• Manganese

Tags

NGSS.HS-PS1-1

If an atom of Sodium has a mass number of 23, it will have...

• 23 protons

• 11 neutrons

• 12 protons

• 12 neutrons

Isotopes are elements with a different amount of

• protons
• neutrons
• electrons
• atoms

Tags

NGSS.HS-PS1-8

an element will always have the same number of 

• neutrons
• protons
• isotopes
• atoms

Which subatomic particle has a positive charge and is found inside the nucleus?

• Electron

• Proton

• Neutron

• Nucleus

Which subatomic particle has a neutral charge and is found inside the nucleus?

• Electrons

• Protons

• Neutrons

• Nucleus

Which scientist developed this model?

• Dalton

• Thomson

• Rutherford

• Bohr

What is the maximum number of electrons that can be found in the second shell (energy level)?

• 2

• 8

• 18