Periodic Table & Periodic Trends

Front

What is the trend in atomic radii across a period in the Periodic Table?

Back

Atomic radii decrease from left to right across a period.

Front

What is the trend in atomic radii down a group in the Periodic Table?

Back

Atomic radii increase from top to bottom in a group.

Front

Which element has the greatest atomic radius: H, N, Cl, or Cs?

Back

Cs has the greatest atomic radius.

Front

What is ionization energy?

Back

Ionization energy is the amount of energy required to remove an electron from an isolated atom or molecule.

Front

What is the trend in ionization energy across a period in the Periodic Table?

Back

Ionization energy generally increases from left to right across a period.

Front

What is the trend in ionization energy down a group in the Periodic Table?

Back

Ionization energy generally decreases from top to bottom in a group.

Front

Which element has the fewest valence electrons: beryllium (Be), sodium (Na), oxygen (O), or neon (Ne)?

Back

Sodium (Na) has the fewest valence electrons.

Front

What are valence electrons?

Back

Valence electrons are electrons in the outermost energy level of an atom.

Front

How do valence electrons affect reactivity?

Back

The number of valence electrons affects the reactivity of an element; elements with fewer valence electrons tend to be more reactive.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.