myquizy.com by malike shamel

1. ATomic Structure
Subatomic Particle
myquizy.com

2. Atom: is the smallest particle of
an element.
ATOM
NUCLEUS SHELLs
PROTON NEUTRON ELECTRON
SUBATOMIC PARTICLE

3. Properties of Subatomic Particle
Protons
● Protons are positively
charged subatomic particles.
The charge of a proton is +1e,
which corresponds to
approximately 1.602 × 10-19
● The mass of a proton is
approximately 1.672 × 10-24
● Protons are over 1800 times
heavier than electrons.
● The total number of protons
in the atoms of an element is
always equal to the atomic
number of the element.
Neutrons
● The mass of a neutron is
almost the same as that
of a proton i.e. 1.674
×10-24
● Neutrons are electrically
neutral particles and
carry no charge.
● Different isotopes of an
element have the same
number of protons but
vary in the number of
neutrons present in their
respective nuclei.
Electrons
● The charge of an electron
is -1e, which
approximates -1.602 ×
10-19
● The mass of an electron
is approximately 9.1 ×
10-31
.
● Due to the relatively
negligible mass of
electrons, they are
ignored when calculating
the mass of an atom.

4. A
Z
X
Atomic number (Z) = number of
proton
Mass Number (A) = sum of the
mass number and atomic number.
35
17
Cl
– Whenever an atom carries no charge.
Z = p = e
-
– Whenever an atom carries a charge either
positive or negative charge.
Z = p ≠ e
-
Mass Number (A) = 35
Atomic number (Z) = 17
A = Z + N
A = P + N
Number of Neutron (n) = A - Z
– If the atom carries a positive charge we
subtract. Na
+1
– But if the atom carries a negatively charge
we add in term of the electron. O–2

5. 35
17
Cl &
Calculate the:
i) number of proton
ii) number of electron
iii) number of neutron
35
17
Cl–1
35
17
Cl
Z = p = e
–
P = ?, Z = 17, A = 35
17 = 17 = 17
P = 17, Z = 17, e
–
= 17
Number of Neutron (n) = A - Z = 35 - 17
= 18
35
17
Cl–1
Z = p ≠ e
-
17 = 17 = 18
Number of Neutron (n) = A - Z = 35 - 17
= 18
P = 17, Z = 17, e
–
= 18

6. Copy and complete the table below
ELEMENT Atomic number Mass Number Number of
Electron
Number of
Neutron
Number proton
O–2
8 8
Ca 40
20
Al+3
10 10
16 10 8
20 20 20
13 23 13