Periods of the Periodic Table

How are elements primarily arranged in the periodic table?

• By alphabetical order of their names.

• By increasing atomic mass.

• By increasing atomic number.

• By their reactivity with water.

What information do the periods in the periodic table provide about an atom?

• The number of protons in the nucleus.

• The number of neutrons in the nucleus.

• The number of electron shells or orbitals.

• The atomic mass of the element.

How many periods are on the periodic table?

• 12
• 7
• 5
• 10

What do you look at to know how many electrons you need to spread out among the shells?

• The mass number of the element.
• The number of protons in the nucleus.
• The element's position on the periodic table.
• The atomic number of the element.

What happens to the atomic radius as you move from left to right across a period in the periodic table, and why?

• It increases because more electrons are added to new shells.

• It decreases because the electromagnetic attraction pulls outer electrons inward more strongly.

• It remains constant because the number of shells stays the same.

• It increases due to increased electron-electron repulsion.