Chemistry Midterm 24-25

Front

What atom matches this electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

Back

Zinc

Front

A bar of copper has a mass of 216g and a volume of 24cm³. What is the density of copper?

Back

9.0 g/ml

Front

Express 4.57 X 10⁻⁴ into decimal form

Back

0.000457

Front

What's a valence electron?

Back

Electrons in the outermost energy level.

Front

What is the name of Groups 17?

Back

Halogens

Front

Define density in terms of mass and volume.

Back

Density = Mass/Volume.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.

Front

What are isotopes?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the formula for calculating the number of moles?

Back

Moles = Mass (g) / Molar Mass (g/mol).