Flashcard on UNIT 3 (Atomic Structure)2

Front

What is the correct order of energy for sub-shells?

Back

1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p

Front

What is the atomic number of magnesium (Mg)?

Back

12

Front

Which model proposed that electrons exist in regions of space called orbitals?

Back

Quantum mechanical model

Front

What is the correct electronic configuration for silicon (Si)?

Back

1s2 2s2 2p6 3s2 3p2

Front

Which element forms a cation with the configuration of a noble gas by losing one electron?

Back

Sodium

Front

What is an electron?

Back

A subatomic particle with a negative charge.

Front

What is an atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is a cation?

Back

A positively charged ion formed by losing electrons.

Front

What is an anion?

Back

A negatively charged ion formed by gaining electrons.

Front

What is the significance of the quantum mechanical model?

Back

It describes the behavior of electrons in atoms as wave functions.