Question

A part of periodic table is shown in the following figure.
14
15
16
17
a.
Write the symbol of the element 'B'.
Will elements 'C' and 'D' have same number of valence electrons?
Arrange elements 'A', 'B' and 'C' in increasing order of their metallic character.
What is the number of electrons in L shell of element ‘E??
Name any two elements that will have properties similar to that of element ‘A’.
d.
e.​

Answer 1

Answer:

Question 1:

Rearrange the columns 2 and 3 so as to match with the column 1.

Column 1 Column 2 Column 3

i. Triad

ii. Octave

iii. Atomic number

iv. Period

v. Nucleus

vi. Electron a. Lightest and negatively charged particle in all the atoms

b. Concentrated mass and positive charge

c. Average of the first and the third atomic mass

d. Properties of the eighth element similar to the first

e. Positive charge on the nucleus

f. Sequential change in molecular formulae

1.Mendeleev

2. Thomson

3. Newlands

4. Rutherford

5. Dobereiner

6. Moseley

ANSWER:

Rearrange the columns 2 and 3 so as to match with the column 1.

Column 1 Column 2 Column 3

i. Triad

ii. Octave

iii.Atomic number

iv. Period

v. Nucleus

vi. Electron a. Average of the first and the third atomic mass

b. Properties of the eighth element similar to the first

c. Positive charge on the nucleus

d. Sequential change in molecular formulae

e. Concentrated mass and positive charge

f. Lightest and negatively charged