WorksheetsATOMIC STRUCTURE
Total questions: 50
Worksheet time: 20mins
Cathode rays were discovered by ____________.
William Crooke
J.J.Thompson
William Crookes
J.J.Thomson
(a) conceived that matter is made up of particles called paramanus.
The word 'atom' is a Latin word meaning indivisible because they are considered as an ultimate particle beyond sub-division.
False
True
Which subatomic particle creates ISOTOPES for an element?
Protons
Neutrons
Electrons
Nucleus
What is the atomic number of this atom?
9
4
13
5
What is the mass number?
the number of protons and electrons
the number of protons
the number of neutrons
the number of protons and neutrons
Which particle is used to identify the element?
Neutrons
Protons
Electrons
Electronic configuration
Modern atomic theory correlates with Dalton's atomic theory in the fact that -
an atom is the indivisible particle of an element.
atoms of the same element are alike in all respects.
atoms are the smallest unit of the matter taking part in a chemical reaction.
atoms are indestructible.
Cathode rays have (a) energy.
Electrons were discovered by (a) .
Why Lord Rutherford used gold foil instead of any other foil?
Gold is most ductile metal
No other metal was available
Gold is most malleable metal
None of the above
What is the charge of an electron?
-1
0
1
+1
Which particles are emitted from the source labelled 'A'?
(a)
According to James Chadwick, the mass of neutron is ____________ to the mass of protons.
double
equal
almost equal
(a) used a modified cathode ray.
Bohr called orbits as (a) levels.
Atomic number is equal to
number of protons
number of electrons
both of the above
none of the above
An atom gets it mass from __________.
protons
neutrons
both of the above
electrons
Who gave modern periodic table?
(a)
Relative atomic mass is equal to number of times one molecule of an element is heavier than the mass of an atom of hydrogen
True
False
How many maximum electrons may be there in M shell?
18 electrons
16 electrons
19 electrons
20 electrons
Which is the correct electronic configuration of sodium?
[2,8,1]
[2,9]
Both of the above
None of the above
Atomic number is denoted by _______.
A
N
Z
V
Sodium chloride is formed by _____________ of electrons.
transfer
sharing
Sharing of electrons is also called as (a) .
Noble gases have their valence shell (a) .
Valency of oxygen in water is 2 because ________________.
1 hydrogen atom combines with two oxygen atoms.
1 oxygen atom combines with two hydrogen atoms.
both of the above
none of the above
Nitrogen atom on gaining three electrons becomes _________.
Nitride ion
Nitrogen ion
Nitric ion
Nitrous ion
Anions are (a) charged particles.
On losing of electrons, an element becomes ___________ charged ions.
neutral
negatively
positively
none of the above
If an atom has 17 electrons, state the number of protons it contains.
(a)
If an atom has 8 protons and 8 electrons, what will be the atomic number?
16
8
4
9
If an atom ‘A’ has an atomic number of 12, state the number of protons and electrons it contains.
12 protons, 6 electrons
6 protons, 12 electrons
6 protons, 6 electrons
12 protons, 12 electrons
The mass number of an atom is 17. There are 8 neutrons in the nucleus of the atom. What is the number of protons present in the nucleus of the atom?
(a)
An atom has 13 electrons and its mass number is 25. Find the number of neutrons.
11
13
25
12
An atom has 18 electrons, 18 protons and 17 neutrons. Find the mass number.
(a)
The mass number of an atom is 19. It has 10 neutrons. Find the number of electrons.
9
29
19
10
The atomic number of silicon is 14 and its mass number is 28. Write its electronic configuration.
[2,8,2,2]
[2,8,4]
[2,8,8,8,2]
[2,8,8]
Phosphorus has atomic number 15. How many electrons will be present in its outermost shell?
15
5
13
8
Which element is given in the picture?
Magnesium
Silicon
Aluminium
Neon
Atomic number of Magnesium is 12. Write its electronic configuration.
(a)
Mass number of an atom is 9. It has 5 neutrons. Write its electronic configuration.
(a)
An element loses 3 electrons to complete its octet.
It is a __________.
noble gas
non-metal
metal
none of the above
An atom has 5 electrons in its outermost shell. It combines or gains 3 electrons to become stable. The atom is a __________.
Noble gas
Metal
Non-metal
Atomic number of boron is 5. Find out its valency.
+3
-3
+2
-2
Valency of an element is -2. It is a ___________.
metal
Noble gas
non-metal
The electronic configuration of carbon is [2, 4]. What will be its valency?
(a)
Hydrogen is a metal as well as a non-metal.
False
True
Elements are arranged in (a) order of atomic number.
The image shows the standard representation of Sulphur atom. What is '16' in the given picture?
mass number
atomic number
