Atomic Structure & Trends

Front

What is the number of valence electrons in aluminum (Al)?

Back

3

Front

How many valence electrons does a chlorine atom have?

Back

7

Front

Which element has the lowest ionization energy?

Back

Cesium (Cs)

Front

How many atoms are in the compound NH4?

Back

5

Front

Which subatomic particle is used to identify an element?

Back

Protons

Front

Define valence electrons.

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom in its gaseous state.

Front

Explain the trend of ionization energy across a period in the periodic table.

Back

Ionization energy generally increases across a period from left to right due to increasing nuclear charge.

Front

Explain the trend of atomic radius down a group in the periodic table.

Back

Atomic radius increases down a group due to the addition of electron shells.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number and identity of an element.