chemistry

Question 1

3 subatomic particles

Answer 1

-protons
-electrons
-neutrons

Question 2

The scientists in order

Answer 2

1.democritus
2.dalton
3.thompson
4.rutherford
5.bohr
6.chadwick

Question 3

atom vs. element

Answer 3

Elements are a pure substance and Atoms are the smallest units of elements

Question 4

elements vs. compound

Answer 4

element: a pure substance that cannot be broken down into simpler substances (hydrogen, sodium, oxygen, chlorine.)

compounds: a pure substance that contains 2 or more different elements in a fixed ratio ( salt, sugar, water, carbon dioxide.)

Question 5

where r groups and periods located on a periodic table

Answer 5

group- column
period- horizontal row

Question 6

metal properties & non metal properties

Answer 6

metal properties- solid (except mercury) , shiny, good conductor, malleable, ductile

non-metal properties- solid, liquid, gas, dull, poor conductors, brittle, not ductile

Question 7

why are atoms neutral

Answer 7

atoms contain the same number of protons and electrons making their overall charge always neutral

Question 8

elements in the same group are called

Answer 8

valence electrons

Question 9

elements in the same row are called

Answer 9

orbitals

Question 10

4 chemical families & physical & chemical properties

Answer 10

Alkali ( group 1) - 1 valence electron - most reactive

Alkaline earth metals ( group 2) - 2 valence electrons - slightly less reactive

Halogens ( group 7) - 7 valence electrons - most reactive non metal

Noble gases ( group 8) - 8 valence electrons - unreactive and stable

Question 11

valence electrons in group vs row

Answer 11

group - same number
row - increased by 1

Question 12

orbitals in a group vs row

Answer 12

group - increased by 1
row - same number