Notes 4 Test Review

What did chemists initially use to organize elements into groups?

• Color

• Atomic mass

• Properties

• Discovery date

Who arranged elements into triads based on similar properties?

• Henry Moseley

• Dmitri Mendeleev

• J.W. Dobereiner

• John Dalton

Who created the first periodic table?

• J.W. Dobereiner

• Dmitri Mendeleev

• Henry Moseley

• Antoine Lavoisier

How did Mendeleev arrange the elements?

• Alphabetically

• By atomic number

• By atomic mass

• By reactivity

Henry Moseley improved the periodic table by arranging elements based on:

• Atomic mass

• Reactivity

• Atomic number

• Melting point

What does periodic law state?

• Elements are grouped alphabetically.

• Properties of elements repeat periodically by atomic number.

• Elements are grouped by reactivity only.

• Elements are arranged randomly.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Horizontal rows on the periodic table are called:

• Periods

• Groups

• Families

• Sections

Vertical columns on the periodic table are called:

• Sections

• Groups

• Rows

• Periods

What do elements in the same group have in common?

• Same atomic number

• Same melting points

• Similar physical and chemical properties

• Same mass

What are valence electrons?

• Electrons in the innermost shell

• Electrons in the outermost shell

• Protons in the nucleus

• Neutrons in the nucleus