Ch. 4/5 Review

Front

What is the orbital notation for oxygen?

Back

Oxygen has the orbital notation: 1s² 2s² 2p⁴.

Front

How do you calculate the average atomic mass of an element with two isotopes?

Back

Average atomic mass = (mass1 * abundance1) + (mass2 * abundance2). For the given isotopes: (10.013 amu * 0.199) + (11.01 amu * 0.801) = 10.812 amu.

Front

What atom corresponds to the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰?

Back

The atom is Zinc (Zn).

Front

Who performed the gold foil experiment that led to the discovery of the atomic nucleus?

Back

Eugen Rutherford.

Front

What is an atomic mass unit (amu)?

Back

1/12 the mass of a carbon-12 atom.

Front

What is the significance of the atomic number?

Back

The atomic number defines the number of protons in an atom and determines the element's identity.

Front

What is the difference between mass number and atomic mass?

Back

Mass number is the total number of protons and neutrons in an atom, while atomic mass is the weighted average mass of an element's isotopes.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the electron configuration for a neutral carbon atom?

Back

The electron configuration for carbon is 1s² 2s² 2p².

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.