First Semester Chemistry

The formula for copper (I) chloride is 

• CoCl₂
• CoCl
• CuCl
• CuCl₂

Aluminum has _ valence electrons. 

• 7
• 1
• 6
• 3

Tags

NGSS.HS-PS1-1

• 2, 4 methyl-3-ethylpentane
• 3 ethyl-2,4-methylpentane
• 3 ethyl-2,4-dimethylpentane

As an electron moves from energy level 1 to energy level 4, is energy absorbed or released?

• Absorbed
• Released

J.J. Thomson used a cathode ray tube to find what particle in the atom?

• Proton
• Neutron
• Electron
• Photon

What is this element?
1s²2s²2p⁶3s²

• Neon
• Magnesium
• Aluminum
• Potassium

Tags

NGSS.HS-PS1-1

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

How many electrons would an atom of Krypton, neutral charge, have?

• 83.80
• 36
• 12
• 24

Tags

NGSS.HS-PS1-1

Co (cobalt) and Fe (iron) are both

• transition metals
• halogens
• metalloids
• metals

An atom that contains 24 protons, 26 neutrons and 22 electrons would be represented by the symbol: 

• ⁵⁰V³⁺
•  ²⁶Cr²⁺  
• ⁵⁰Cr²⁺  
• None of the above

Tags

NGSS.HS-PS1-1