Question

Fill in the blanks:

1. The formula of chloride of metal M is MCl₂. The metal M belongs to ________ group.

2. ________ group in the periodic table contains elements that are all gases at room temperature.

3. The arrangement of elements in a group of three is known as ________.

4. The law used by Newlands to arrange elements is known as ________.

5. The element eka-aluminium in Mendeleev’s periodic table is known as ________ in the modern periodic table.

6. Elements showing properties of both metals and non-metals are known as ________.

Answer 1

1. The formula of chloride of metal M is MCl₂. The metal M belongs to second group.

2. 18 group in the periodic table contains elements that are all gases at room temperature.

3. The arrangement of elements in a group of three is known as triad.

4. The law used by Newlands to arrange elements is known as Newland's Octaves.

5. The element eka-aluminium in Mendeleev’s periodic table is known as scandium in the modern periodic table.

6. Elements showing properties of both metals and non-metals are known as metalloids.