Midterm 1 Practice

Front

What is the electronic configuration of magnesium (Mg)?

Back

1s²2s²2p⁶3s²

Front

Which quantum number defines the distance of an electron from the nucleus?

Back

Principal quantum number (n)

Front

Rank the following isoelectronic series from largest ionic radius to smallest: Mg2+, Na+, F-, O2-, N3-

Back

N3-, O2-, F-, Na+, Mg2+

Front

What is the electronic configuration of a selenium atom (Se)?

Back

[Ar] 4s²3d¹⁰4p⁴

Front

How many electrons can be described by the quantum numbers n = 2 and ms = +½?

Back

1

Front

Define the term 'isoelectronic'.

Back

Isoelectronic refers to atoms or ions that have the same number of electrons.

Front

What is the significance of the principal quantum number (n)?

Back

It indicates the energy level and distance of an electron from the nucleus.

Front

Explain the concept of ionic radius.

Back

Ionic radius is the measure of an atom's ion in a crystal lattice.

Front

What is the electronic configuration for an atom with atomic number 34?

Back

[Ar] 4s²3d¹⁰4p⁴ (Selenium)

Front

How does the ionic radius change across a period in the periodic table?

Back

Ionic radius generally decreases across a period due to increased nuclear charge.