HIstory of the Periodic Table HW

In the modern periodic table elements are arranged by:

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

Who proposed the Law of Octaves?

• Lothar Meyer

• Henry Moseley

• John Newlands

• Dmitri Mendeleev

• J.J. Thomson

Which scientist organized the periodic table by atomic number?

• Mendeleev

• Moseley

• Dobereiner

• Seaborg

• Dalton

Which scientist is known for the Law of Triads?

• Mendeleev

• Moseley

• Dobereiner

• Seaborg

• Rutherford

The modern periodic table is arranged by ____

• atomic mass

• atomic number

• ion charges

• number of isotopes

The vertical (up and down) columns in the periodic table are called

• groups

• towers

• periods

• atomic numbers

Tags

NGSS.HS-PS1-1

The horizontal (side to side) rows in the periodic table are called

• groups

• families

• periods

• atomic numbers

Which two elements are in the same period?

• boron (B) and lithium (Li)

• beryllium (Be) and calcium (Ca)

• phosphorus (P) and oxygen(O)

• boron (B) and phosphorus (P)

Tags

NGSS.HS-PS1-1

The scientist ____ is credited with the idea of arranging the elements in the periodic table according to their physical and chemical properties.

• Mendeleev

• Dobereiner

• Newlands

• Dalton