chem unit 3

Question 1

scientist who introduced idea of atom

Answer 1

democritus

Question 2

scientist who reintroduced idea of atom with experimental evidence

Answer 2

dalton

Question 3

early periodic table is most credited to

Answer 3

mendeleev

Question 4

in the early periodic table, elements were arranged by

Answer 4

atomic mass and properties

Question 5

current periodic table is arranged acoording to

Answer 5

atomic number

Question 6

who developed the current periodic table

Answer 6

mosesly

Question 7

what is the column on the periodic table called

Answer 7

groups

Question 8

what are the rows on the period table called

Answer 8

periods or series

Question 9

democritus

Answer 9

proposed the idea of atoms

Question 10

dalton

Answer 10

confirmed the idea of atoms, laws of conservation mass, laws of definite proportions

Question 11

lavoisier

Answer 11

invented element symbols and notation

Question 12

mendeleev

Answer 12

created first periodic table organized based on atomic mass

Question 13

moseley

Answer 13

organized periodic table by atomic number, discovered the number of protons define an element

Question 14

atom

Answer 14

basic unit of a chemical element

Question 15

proton

Answer 15

atomic particle that has a positive charge

Question 16

electron

Answer 16

sub atomic particle with negative charge

Question 18

nucleous

Answer 18

positively charged region of an atom

Question 19

atomic number

Answer 19

number of protons in the nucleus

Question 20

mass number

Answer 20

total number of proton and nuetrons in atom

Question 21

atomic mass

Answer 21

amount of matter in an atom

Question 22

isotope

Answer 22

forms of the same element with same protons, but different number of electrons

Question 23

cations

Answer 23

metals, add ion, write charge

Question 24

anions

Answer 24

non metals, change end to ¨ïde¨ and ion