LEC 3 Atoms

Question 1

basic particle of the chemical elements

Answer 1

atom

Question 2

components of an atom

Answer 2

• protons
• neutrons
• electrons

Question 3

inside the nucleus is the ____

Answer 3

neutrons and protons

Question 4

atom means _____ in Greek

Answer 4

indivisible

Question 5

scientist credited for proposing the atomic theory

Answer 5

john dalton

Question 6

3 basis of dalton in his atomic theory

Answer 6

• law of conservation of mass
• law of definite proportions
• law of multiple proportions

Question 7

the total mass present before a chemical reaction is the same as the total mass present after the chemical reaction

Answer 7

law of conservation of mass

Question 8

in a given type of chemical substance, the elements are always combined in the same proportions by mass

Answer 8

law of definite proportions

Question 9

if two elements form more than one compound between them, the masses of one element combined with a fixed mass of the second element form in ratios of small integers

Answer 9

law of multiple proportions

Question 10

father of modern atomic theory

Answer 10

john dalton

Question 11

number of protons in the nucleus of each atom of an element

Answer 11

atomic number (z)

Question 12

total number of neutrons and protons present in the nucleus of an atom of an element

Answer 12

mass number (a)

Question 13

atoms that have the same atomic number but different mass numbers

Answer 13

isotopes

Question 14

positively charged particles

Answer 14

protons

Question 15

neutral particles with a relative mass of about 1

Answer 15

neutrons

Question 16

negative particles

Answer 16

electrons

Question 17

the number of electrons determines its ____ and how it reacts

Answer 17

chemical properties

Question 18

location of:
- protons
- neutrons
- electrons

Answer 18

• nucleus
• nucleus
• orbitals

Question 19

an atom of specific isotope

Answer 19

nuclide

Question 20

unit of atomic mass (u) essential in determining the compositions of chemical compounds

Answer 20

g/mole

Question 21

arrangement of the electrons in an atom into orbitals

Answer 21

electron configuration

Question 22

_____ law states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number

Answer 22

periodic law

Question 23

rows in the periodic table are called

Answer 23

periods

Question 24

columns in the periodic table are called

Answer 24

groups

Question 25

total number of elements in the periodic table

Answer 25

118

Question 26

period numbers correspond to the highest occupied ______

Answer 26

energy level

Question 27

elements with ___ are organized in groups or families

Answer 27

similar properties

Question 28

elements in A groups

Answer 28

representative elements

Question 29

elements in B groups

Answer 29

transition elements