ATOMS & ATOMIC THEORY

Question 1

the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.

Answer 1

CHEMISTRY

Question 2

first to hypothesized the atom and said

“everything you see around you is made up of smaller objects”

Answer 2

DEMOCRITUS

Question 3

proposed the atomic theory in 1808. “father of atomic theory”

Answer 3

JOHN DALTON

Question 4

SMALLES PARTICLE OF AN ELEMENT

Answer 4

ATOM

Question 5

ATOM CAME FROM THE GREEK WORD ____ THAT MEANS IN INDIVISIBLE

Answer 5

ATOMOS

Question 6

WHO DISCOVERED THE “ELECTRON”

Answer 6

SIR JJ THOMSON in 1897

Question 7

CHARGE OF AN ELECTRON

Answer 7

-1.60 × 10−19 C

Question 8

MASS OF AN ELECTRON

Answer 8

9.109X10-31 Kg

Question 9

1amu = ____Kg = 1u (unified atomic mass unit)

Answer 9

1.662 x 10-27

Question 10

WHO DISCOVERED PROTON

Answer 10

ERNEST RUTHERFORD IN 1911

Question 11

CHARGE OF PROTON

Answer 11

+1.6 x 10-19 C

Question 12

MASS OF A PROTON

Answer 12

1.6725 x 10 -27 Kg

Question 13

WHO DISCOVERED NEUTRON

Answer 13

JAMES CHADWICK IN 1932

Question 14

CHARGE OF A NEUTRON

Answer 14

0

Question 15

MASS OF A NEUTRON IN Kg

Answer 15

1.67 x 10 -27

Question 16

how many times larger/smaller is a proton compare to an electron “Mp=_____Me

Answer 16

1836

Question 17

compare the mass of a neutron (Mn) with an electron (Me) “Mn=___Me”

Answer 17

1839

Question 18

atomic number represents the number of ___ in the nucleaus of an atom

Answer 18

protons

Question 19

a neutral atom means that the no. of protons is _____ the no. of electrons

Answer 19

equal to

Question 20

____ = no. of protons + no. of neutrons

Answer 20

Mass number / MN (mass number is always a whole number)

Question 21

atoms with the same no. of protons but different numbers of neutrons

Answer 21

ISOTOPES

Question 22

THE WEIGHTED AVERAGE OF ALL THE MASS NUMBERS OF NATURALLY OCCURING ISOTOPES OF AN ELEMENTS

Answer 22

ATOMIC MASS

Question 23

DIFFERENTIATE ATOMIC MASS AND MASS NUMBER

Answer 23

ATOMIC MASS= THE WEIGHTED AVERAGE OF ALL THE MASS NUMBERS OF NATURALLY OCCURING ISOTOPES OF AN ELEMENTS
Mass number / MN = no. of protons + no. of neutrons