The period and the group number of lithium in the modern periodic table are __ and _ respectively.

3, 2

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2, 1

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1, 2

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2, 2

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Solution

The correct option is B 2, 1
Atomic number of Lithium= 3
Electronic configuration= 2, 1
Period number = No. of shells = 2
Group number = No. of valence electrons = 1

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Similar questions

Answer the following:

1. How could the modern periodic table remove various anomalies of Mendeleev’s periodic table?

2. In the modern periodic table, which are the metals, non-metals and metalloids among the first twenty elements?

3. What are the demerits of Mendeleev’s periodic table?

4. Define atomic size. How does it vary in a period and in a group?

(a) State the modern periodic law.

(b) How many periods and groups are there in the modern periodic table?

P

Q

1

2

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