An element 'M' has atomic number 11. [5 MARKS]
1. Write its electronic configuration.
2. State the group to which 'M' belongs.
3. Is 'M' a metal or a non-metal?
4. Write the formula of its chloride.
5. Name at least four elements present in this group.

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Solution

Each point: 1 Mark

1. Atomic number of M = 11. Electronic configuration: 2, 8, 1.
2. Since, the valence shell contains 1 electron, it belongs to group 1.
3. M is metal, sodium.
4. The formula of its chloride is MCl.
5. Lithium, sodium, potassium, rubidium, caesium and francium.

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An element 'M' has atomic number 11. [5 MARKS] 1. Write its electronic configuration. 2. State the group to which 'M' belongs. 3. Is 'M' a metal or a non-metal? 4. Write the formula of its chloride. 5. Name at least four elements present in this group.

Each point: 1 Mark 1. Atomic number of M = 11. Electronic configuration: 2, 8, 1. 2. Since, the valence shell contains 1 electron, it belongs to group 1. 3. M is metal, sodium. 4. The formula of its chloride is MCl. 5. Lithium, sodium, potassium, rubidium, caesium and francium.

An element 'M' has atomic number 11. [5 MARKS]
1. Write its electronic configuration.
2. State the group to which 'M' belongs.
3. Is 'M' a metal or a non-metal?
4. Write the formula of its chloride.
5. Name at least four elements present in this group.

Each point: 1 Mark

1. Atomic number of M = 11. Electronic configuration: 2, 8, 1.
2. Since, the valence shell contains 1 electron, it belongs to group 1.
3. M is metal, sodium.
4. The formula of its chloride is MCl.
5. Lithium, sodium, potassium, rubidium, caesium and francium.