What can we deduce from the symbol

An atom of helium contains two electrons

1 Which of the following atomic models was proposed by Ernest Rutherford?

The atom is a positively charged sphere.

Isotopes are atoms with the same number of

protons but different number of neutrons.

What is the number of subatomic particles in the aluminium ion , Al3+ . [Nucleon 27, proton 13]

13 protons, 10 electrons and 14 neutrons

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f4 c2 structure of atoms

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Answers

1
The electron arrangement of atom X = 2.8.7. What is the formula of the ions formed from X ?
X7-
X-
X+
X7+
2
What can we deduce from the symbol
Helium atom has 2 protons and 4 neutrons in its nucleus
Helium has a proton number of 4
Helium occurs as a diatomic molecule
An atom of helium contains two electrons
3
Which of the following pairs of elements are isotopes?
Q and R
P and R
R and S
P and Q
4
Which of the following is a molecule?
Sodium chloride
Potassium hexacyanoferate(III)
Neon
Ammonia
5
Which of the following processes, proved the kinetic theory of matter?
Respiration
Diffusion
Photosynthesis
Neutralization
6
Which substance exists as solid at 30 °C ?
R
U
T
S
7
Bromine-79 has 44 neutrons. Calculate the number of neutrons in Bromine-81.
46
90
37
35
8
1 Which of the following atomic models was proposed by Ernest Rutherford?
The atom contains a nucleus that is surrounded by electrons
The atom is the smallest particle
discover nucleus that is surrounded by electrons in orbitals
The atom is a positively charged sphere.
9
Which of following is the electron arrangement of a non-metal R?
2.8.3
2.1
2.8.7
2.2
10
Isotopes are atoms with the same number of
protons and neutrons but different number of electrons.
electrons but different number of protons.
protons, electrons and neutrons
protons but different number of neutrons.
11
Which of the following isotopes is used in archaeology?
Iodine-131
Phosphorus-32
Cobalt-60
Carbon-14
12
How many protons and electrons does an atom of Y contain?
p=8, e=8
p=8, e=10
p=12, e=12
p=12, e=10
13
What is the number of subatomic particles in the aluminium ion , Al^{3+ .}[Nucleon 27, proton 13]
16 protons, 13 electrons and 14 neutrons
13 protons, 16 electrons and 14 neutrons
13 protons, 10 electrons and 14 neutrons
13 protons, 13 electrons and 14 neutrons

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