Periodic Table

How did chemists change Mendeleev’s periodic table in the early 1900s?

• They included chemical properties such as bonding power

• They used atomic number instead of atomic mass to organize the elements

• They used atomic mass instead of atomic number to organize the elements

• They included physical properties such as melting point and density

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Sodium (Na) is found in group 

• 1
• 2
• 3
• 4

What does the atomic mass tell you? 

• Basically,the number of electrons and protons
• The number of neutrons
• Basically, the number of protons and neutrons
• The number of protons.

What does the 6 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

Tags

NGSS.MS-PS1-1

What does 12.011 represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

Tags

NGSS.MS-PS1-1

What does the C represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

Tags

NGSS.HS-PS1-1

These are found on the Periodic Table.

• Compounds
• Elements
• Mixtures

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers