Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 5

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 5

1. Lother Meyer tried to remove defects in Newlands table in ________

a) 1869
b) 1864
c) 1888
d) 1860

2. Atomic mass is directly proportional to atomic radius?

a) True
b) False

3. Concept of atomic numbers was introduced by Mosley in _______?

a) 1913
b) 1892
c) 1869
d) 1943

4. Difference between atomic mass and atomic number is _________. Short..Answer...................................................
Atomic mass is equal to -------- + neutrons of an element and relates to properties of elements.
Atomic number is equal to number of _____in an element and relates to position of that element in periodic table.

a) neutrons
b) protons
c) electrons

5. How atomic number is given to an element?

a) It is given according to the atomic mass of element in periodic table.
b) It is given according to the position of element in periodic table.
c) It is given according to the position of element in periodic table and its atomic mass.

6. There is no difference between atomic size and atomic radius?

a) True
b) False

7. What is atomic size or radius? Short..Answer…………………………………
Average distance between the nucleus of an atom and its _____most electronic shell. Its units are nm or pm.

a) inner
b) outer

8. What is the use of Nanometer and Picometer?

a) To measure very very small things like the weight of atom.
b) To measure very very small things like the size of atomic radius.
c) To measure very very small things like the width of atomic radius.
d) To measure very very small things like the length of atomic radius.ms

9. Who gave the idea of atomic number in 1913?

a) Lother-Meyer
b) Dobereiner
c) Mosely
d) Mendeleef

10. Why concept of atomic numbers was introduced?

and

a) E. A and D are coorect
b) B. It followed regular sequence
c) A. Mendeleef table was as per atomic masses
d) C. Isotopes can be given different positions.
e) D. It could not follow regular sequence as isotopes could not be given different positions.

This is more feedback!

This is the feedback!