Question

Fill in the following blanks with suitable words
(a) The basis for modern periodic table is ...............
(b) The horizontal rows in a periodic table are called ...............
(c) Group 1 elements are called ...............
(d) Group 17 elements are known as ...............
(e) Group 18 elements are called ...............
(f) According to Newland's classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the ............... element starting from oxygen.

Answer 1

Answer:

Explanation:

a--atomic number

b--periods

c--alkali metals

d-- halogens

e--noble gases

f--eighth

Answer 2

Periodic Table is Based Upon Atomic Number

Explanation:

(a) The new or modern periodic table is made on the basis of atomic number.

(b) They are called periods and the vertical rows in a periodic table are called as groups.

(c) Group 1 elements are alkali, these are the bases which can be mixed with water.

(d) They are known as Halogens. Halogens are the group of non-metallic elements.

(e) They are known as Noble gases. Noble gases are nonreactive gases.

(f) This is because sulphur is the eighth element starting from oxygen. According to Newland’s statement the property of the element is similar to the element which has 8th position from the starting element.