PS Chapter 5 Formative

Mendeleev's decision to leave gaps in his periodic table was supported by the discovery of

• electrons

• protons

• argon

• gallium

In a modern periodic table, elements are arranged in order of

• atomic number

• number of isotopes

• atomic mass

• number of neutrons

How many periods does the periodic table have?

• 18

• 7

• 9

• 8

An atomic mass unit is

• 1/12th the mass of a carbon-12 atom

• the mass of a carbon-12 atom

• the mass of an electron

• the mass of 12 carbon atoms

Tags

NGSS.MS-PS1-1

An element that is shiny and conducts electric current is likely to be a

• gas

• metal

• metalloid

• nonmetal

Tags

NGSS.MS-PS2-3

Copper is an example of

• an alkali metal

• an alkaline earth metal

• a nonmetal

• a transition metal

Elements that have the same number of valence electrons are

• in the same period

• in the same group

• called noble gases

• called transition metals

The most reactive metals are

• transition metals

• alkaline earth metals

• alkali metals

• metalloids

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which elements are all gases at room temperature?

• Group 1A

• Period 3

• Group 7A

• Group 8A

Mendeleev arranged the elements in his periodic table in order of

• atomic number

• number of electrons

• mass

• number of neutrons