Question

CHECKPOINT
Choose the correct option.
The mass number of an niomis
3. Only mendesbiblt vanlile valency
In the periodic table, clements are range
in the increasing onder of some mase
5. The number of electrons en deconis et
can accommodatie
6. Hydrogen chonde is formed by refere
electrons from hydropen tochtone
D. Match the words in the two columns,
2) K shell
Columin A
twice the atomie number
b) the mass of the protons and electrons
c) the nearest whole number to the atomic
mass
2) the mnrs of the nucleus
"The outermost electronic level of an atom in
called the
b) octet shell
c) valence shell
.) unGlled level
If the mass number of an atom is 31, and
the atomic number is 15, the number of
neutrons is
a) 46 b) 15
c) 16 0)31
4. If the atomic number of an element is 13,
its electronic configuration is
b) 2,18,6
d) 2, 8,8
5. If the number of valence electrons in an
atom is 7, its valency will be
b) 1
c) multiple valency d) 6
1. Rutherford
2. Nics Bohe
3. Democritus
4. Thomson
5. Millikan
cathode ray tube
pold foil experimen
I charge of andectron
ly, theory of the univers
V bxed orbis
a) 2,8,16
c) 2, 8,3
E. Define the terms.
1. atomic number
3. Isotope
2 atomic mass
4. valency
a) 7
B. Give one word for the following.
1. The basic unit of matter
2. The mass of the atom is concentrated here
3. The path of an electron inside an atom
4. The combining capacity of an element
5. A neutral subatomic particle with unit mass
6. Atoms with different numbers of neutrons
and the same number of protons
F. Short-answer questions
1. What are fundamental partides Where are
they found Give the mass and charpe of
each to the nearest whole number
2. Complete the following table.
(A: symbol, B, element name, atomic
number, D. number of protons, number
of electrons, I, number of neutrons and
G: mass number)
E
A
L
C
3
Na
sulphur 16
18
Ar
c. Say if the statements are true or false.
1. There are 181 elements in the periodic table,
2. Electrons and protons contribute to the
mass of an atom.
61​

Answer 1

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