Atoms & Atomic Radius Check In

Atomic radius _________ from left to right across a period

Which element is in group 15, period 5?

• arsenic

• germanium

• antimony

• phosphorus

Which element is this?

• magnesium

• neon

• calcium

• beryllium

Why are alkali metals and alkaline earth metals reactive?

• because they have lots of valence electrons

• because they have a large atomic radius

• because they have lots of protons

• because the have only one or two valence electrons

How many valence electrons does chlorine have?

Which element has the smallest atomic radius?

• sulfur

• chlorine

• fluorine

• nitrogen

Which group of elements tend to lose electrons in a reaction?

• metals

• non-metals

• metalloids

Which group of elements tend to gain electrons in a reaction?

• metals

• non-metals

• metalloids

Draw the electron shell diagram for carbon

Place these elements in order from smallest to largest atomic radius

• silicon

• oxygen

• sulfur

• helium

• fluorine