Periodic Table

He arranged known elements according to their atomic masses in the late 1800's

• Henry Moseley

• Dimitri Mendeleev

He arranged known elements according to their atomic numbers in 1913

• Henry Moseley

• Dimitri Mendeleev

Horizontal rows on the periodic table are called?

• groups

• periods

Vertical columns on the periodic table are called?

• groups

• periods

Energy _______ are found within the electron cloud

• levels

• blasts

• drinks

Tags

NGSS.HS-PS1-1

How many electrons can the 1st energy level hold?

• 2

• 8

• 18

• 32

The 4th energy level can hold a maximum of __ electrons?

• 2

• 8

• 18

• 32

Scientists use these to illustrate the number of electrons in an atoms outermost energy level

• telegrams

• electron dot diagrams

These elements lose electrons easily, are good conductors of heat and electricity, and are found on the left side of the periodic table

• metals

• metalloids

• nonmetals

These elements share properties of both metals and nonmetals

• metals

• metalloids

• nonmetals