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First, fourth and fifth periods of the l...

First, fourth and fifth periods of the long form the periodic table consist of elements respectively:

A

1. 2,8,8

B

2. 8,8,18

C

3. 2,18,18

D

4. 2,8,18

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • The number of periods in the long form of the periodic table is:

    A
    Seven
    B
    Nine
    C
    Eighteen
    D
    As many as groups.

  • In a group of the periodic table, the elements possess:

    A
    same number of electrons
    B
    same number of protons
    C
    same number of neutrons
    D
    same number of electrons in the outermost shell.

  • The 18th group of elements in the periodic table is called

    A
    alkali metals
    B
    alkaline earth-metals
    C
    halogens
    D
    noble gases

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    a) What are groups and period in the periodic table? b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary? 1) Sizes of their atoms 2) Their metallic characters. 3) Their valencies informing oxides. 4) Molecular formula of their chlorides.

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    The number of elements in the fifth period of periodic table is

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