Periodic and Atomic Trends

Front

What is the atomic number of an element with 5 protons?

Back

5

Front

What happens to the energy of an electron as it moves farther from the nucleus?

Back

The energy increases.

Front

Who arranged the elements on the periodic table based on atomic number?

Back

Henry Moseley

Front

Which element is the least reactive: Iodine, Silicon, Silver, or Argon?

Back

Argon

Front

What does the atomic number of magnesium (12) indicate about its nucleus?

Back

It contains 12 protons.

Front

What is the definition of an atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the relationship between atomic number and the position of an element in the periodic table?

Back

Elements are arranged in order of increasing atomic number.

Front

What is the significance of neutrons in an atom?

Back

Neutrons contribute to the atomic mass and stability of the nucleus.

Front

How does the number of electrons relate to the charge of an atom?

Back

An atom is neutral if it has an equal number of protons and electrons.

Front

What is the trend in reactivity for alkali metals as you move down the group?

Back

Reactivity increases down the group.