Atoms, elements, compounds, mixtures

Question 1

give examples of elements living in single atoms

Answer 1

helium, neon, argon, krypton(maybe expected to identify diagram)

Question 2

give examples of molecules

Answer 2

oxygen, hydrogen, nitrogen(maybe expected to identify diagram)

Question 3

examples of giant structures

Answer 3

carbon, iron, copper, sodium(maybe expected to identify diagram

Question 4

Formula for relative atomic mass(Ar)

Answer 4

sum of (isotope abundance * isotope mass number) / sum of abundance of all isotopes

Question 5

relative mass and charge for proton

Answer 5

1 and +1

Question 6

relative mass and charge for neutron

Answer 6

1 and 0

Question 7

relative mass and charge for electron

Answer 7

very small and -1

Question 8

what does the mass number tell you

Answer 8

number of protons and neutrons

Question 9

what does the atomic (proton) number tell you

Answer 9

number of protons

Question 10

how do you get the number of neutrons

Answer 10

subtract the atomic number from the mass number

Question 11

what is an isotope

Answer 11

isotopes have the same number of protons but different number of neutrons. Isotopes are different forms of the same element.

Question 12

give examples of an isotope

Answer 12

carbon-12 and carbon-13

Question 13

what charge is an atom

Answer 13

neutral-because they have the same number of protons as electrons

Question 14

what are compounds

Answer 14

Compounds are substances formed from two or more elements. They are held together by chemical bonds.

Question 15

how many electrons are allowed in each shell

Answer 15

1st shell: 2
2nd shell: 8
3rd shell: 8