WorksheetsGrade IX
Total questions: 10
Worksheet time: 5mins
An atom has a mass number of 37 and atomic number 17. How many protons does it have?
20
19
18
17
What would be the atomic number of the element in whose atom the K and L shells are full?
10
12
14
16
The electronic configuration of an atom having atomic number 20 is
2, 8, 8, 2,
2, 8, 6, 4,
2, 4, 10, 6
2, 10, 5, 3
How many electrons does the outermost shell of neon have?
2
8
18
32
Almost the entire mass of an atom is concentrated in the
Proton
Neutron
Electron
Nucleus
An element has an electronic configuration of 2, 8, 7. Its valency is
4
1
3
2
Which of the following is the correct electronic configuration of Nickel with an atomic number 28?
1s2 2s2 2p4 3s2 3p8 3d10
1s2 2s2 2p6 3s2 3p6 3d10
1s2 2s2 2p4 3s2 3p6 3d10 4s2
1s2 2s2 2p6 3s2 3p6 3d8 4s2
The valency of carbon is
3
2
1
4
The symbol of Gold element is
Na
Au
Hg
Pb
Which of the following is the diatomic molecule?
O2
S8
P4
O3
