Atomic Structure & Periodic Table Review

Metals have a shiny luster while nonmetals have a _____ luster.

• shiny

• dull

• neither shiny or dull

How many electrons does a sodium atom contain?

• 23

• 11

Use your periodic table. What is the atomic number for iron?

• 26

• 56

The outermost electrons are called ______ electrons.

• nothing

• valence

• electron cloud

• energy levels

Charles needs a very lightweight metal. Use the periodic table to determine which he would choose.

• silicon

• magnesium

• iodine

• tungsten

Use your periodic table. What is the atomic mass of boron?

Look at your periodic table of elements for cobalt (27) and nickel (28). What is the biggest difference between an atom of cobalt (Co) and an atom of nickel (Ni) as show in the periodic table?

• An atom of nickel has more protons.

• An atom of cobalt has more electrons.

• An atom of cobalt has more neutrons.

• An atom of nickel has a higher value for atomic mass.

How many valence electrons does group 2 contain?

All the matter is made up of the same atom. Which sentence correctly describes atoms?

• All substances are made of the same atom.

• An atom is the smallest particle of the nucleus.

• An atom is the smallest particle of an element.

• An atom is a substance that has been cut in half.

Neutrons are found in the nucleus of an atom and have a ______ charge.