Chapter 4 & 5 Review

Front

What happens when an electron moves to a higher energy level?

Back

The electron has gained energy.

Front

Which of the following is not a characteristic of metals?

Back

Most metals are brittle.

Front

What did Mendeleev mean by eka-aluminum?

Back

An unknown element that he predicted would be discovered with properties similar to aluminum.

Front

What is the unit for atomic mass?

Back

amu (atomic mass unit).

Front

What causes the glowing of a neon light?

Back

The movement of electrons from a higher energy level to a lower energy level.

Front

Define atomic number.

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties, allowing predictions about their behavior.

Front

What are isotopes?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

Explain the term 'ionization energy.'

Back

The energy required to remove an electron from an atom or ion.

Front

What is the difference between a cation and an anion?

Back

A cation is a positively charged ion, while an anion is a negatively charged ion.