periodic table

What motivated Mendeleev to pursue his scientific achievements?

• His own curiosity

• His siblings' support

• His mother's sacrifices

• His father's encouragement

What was Mendeleev's key realization about the elements?

• They should be sorted by periodicity

• They should be sorted by reactivity

• They should be sorted by atomic weight

• They should be sorted by color

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What did Mendeleev do when he realized some elements were missing from his table?

• He ignored the missing elements

• He changed the order of known elements

• He inserted gaps for undiscovered elements

• He gave up on his theory

Which group of elements is extremely reactive and forms positive ions?

• Noble gases

• Halogens

• Transition metals

• Alkali metals

What did Mendeleev believe about the periodicity of elements?

• It had no real significance

• It was a minor detail

• It was a mystical phenomenon

• It had far-reaching consequences