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Question 511 Mark

What is the number of elements in:

Answer

Question 521 Mark

Name three elements that have a single electron in their outermost shells.

Answer

Lithium, Sodium, Potassium.

Question 531 Mark

Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.

Answer

Periods have elements with consecutive atomic numbers.

Question 541 Mark

State one reason for keeping fluorine and chlorine in the same group of the periodic table.

Answer

Fluorine and chlorine have been placed in the same group because both of them have 7 valence electrons.

Question 551 Mark

On which side of the periodic table will you find non - metals?

Answer

Right side.

Question 561 Mark

State modern periodic law.

Answer

The modern periodic law states that the properties of elements are a periodic fu nction of their atomic numbers.

Question 571 Mark

Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga.

Answer

Ga < Mg < Ca < K.

Question 581 Mark

Find the neutral atom in the periodic table which has the same number of electrons as $K ^{+}$and Cl . What is this number?

Answer

Argon atom, 18 electrons.

[1 Mark Questions] - Page 2 - Science STD 10 Questions - Vidyadip

Science [1 Mark Questions]