Periodic Table and Trends

These are found on the Periodic Table.

• Compounds
• Elements
• Mixtures

the positively charged subatomic particle contained in the nucleus of an atom

• proton

• neutron

• electron

• matter

a unique number for each element that equals the number of protons in an atom of that element

• element name

• element symbol

• atomic number

• atomic mass

the mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom

• element name

• element symbol

• atomic number

• atomic mass

Who organized the Periodic Table by atomic mass?

• Mendeleev

• Bohr

• Mosely

• Meyers

As you move left to right on a row or period what happens?

• Atomic number increases by 1

• Electrons decrease

• Number of shells decrease

• Nothing

What happens to the number of shells as you move down a group?

• They decrease by 1

• They increase by 1

• Nothing

The first energy shell can hold ______ electrons.

• 2

• 8

• 18

All elements in the same row have the same number of shells.

• True

• False

• Sometimes

Mendeleev's genius was his ability to

• predict elements that were not discovered yet

• organize elements by their mass

• had an element named after himself

• organize elements by properties