the atom and stuff (10)

Question 1

the atom

Answer 1

• has the same number of protons and electrons
• number of neutrons = mass number - protons
• atomic mass (bottom) > atomic number (top)

Question 2

calculating relative atomic mass

Answer 2

percentage of which the element occurs over 100 multiplied by its atomic mass added together

Question 3

calculating mass with amu

Answer 3

atomic mass over 12 x 1,99 x 10-26

Question 4

atomic number

Answer 4

the number of protons

Question 5

mass number

Answer 5

the total number of protons plus neutrons

Question 6

protons + neutrons

Answer 6

nucleons

Question 7

3 isotopes for hydrogen

Answer 7

protium (1:1)
deuterium (2:1)
tritium (3:1)

Question 8

group number

Answer 8

number of valence electrons

Question 9

group 1

Answer 9

alcheli metals

Question 10

group 2

Answer 10

alcheline earth metals

Question 11

group 16

Answer 11

chalkogens

Question 12

group 17

Answer 12

halogens

Question 13

group 18

Answer 13

nobel gases

Question 14

periodicity of atomic radius

Answer 14

• decreases from left to right in a given period

- increases top to bottom in a group

Question 15

melting and boiling point (with metals)

Answer 15

• increases from left to right in a period

- decreases from top to bottom in a group

Question 16

melting and boiling point with non - metals

Answer 16

• decrease from left to right in a period

Question 17

density with metals

Answer 17

• increase from left to right in a period

- decrease from top to bottom in a group

Question 18

density with non-metals

Answer 18

• decrease from left to right (period)

- decrease from top to bottom in a group