Periodic Table

In 1869, Dmitri Mendeleev developed the first periodic table, organizing the elements according to atomic weight. When he ordered the elements, he noticed that there were patterns of repeating properties. The modern periodic table sequences elements from left to right by atomic number.

This was the first person to organize a periodic table.

• Neils Bohr

• Dmitri Mendeleev

• Democritus

• Ernest Rutherford

what is the biggest group on the table

• metals

• nonmetals

• metaloids

• halogens

how many rows are on the table

• 4

• 5

• 6

• 7

how many groups/families are on the table

• 15

• 16

• 17

• 18

where are the metaloids found

• far left, vertical

• stair step/diagonal

• far right horizontal

• at the bottom

period

• Elements that occur in vertical columns on the periodic table.

• A horizontal row of elements in the periodic table

• Found in group two of the periodic table; highly reactive

• A subatomic particle that has a negative charge

atomic number

• gas at room temperature, low boiling point

• a subatomic particle that has a negative charge

• number or protons and neutrons

• the number of protons in the nucleus of an atom

A subatomic particle that has a positive charge and that is found in the nucleus of an atom

• Proton

• elecrtron

• groups

• neutrons

Tags

NGSS.MS-PS1-1

A subatomic particle that has a negative charge

• nobles gases

• protons

• electrons

• neutrons

Tags

NGSS.MS-PS2-3

The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds

• alkali metals (group 1)

• Halogens (Group 17)

• atomic number

• valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2