1. Tardigrade
  2. Question
  3. Chemistry
  4. According to Mendeleev's periodic classification, the electronic configuration of hydrogen atom resembles that of alkali metals, which are given below as: H = 1s1, Li = 2s1, Na = 3s1, K = 4s1 On the other hand like halogens, hydrogen also exist as diatomic molecules, such as: H2, Cl2, Br2, I2, etc. On the basis of above information hydrogen can be placed with :

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Q. According to Mendeleev's periodic classification, the electronic configuration of hydrogen atom resembles that of alkali metals, which are given below as :
$H = 1s^{1}, Li = 2s^{1}, Na = 3s^{1}, K = 4s^{1}$
On the other hand like halogens, hydrogen also exist as diatomic molecules, such as : $H_{2}, Cl_{2}, Br_{2}, I_{2}$, etc.
On the basis of above information hydrogen can be placed with :

Classification of Elements and Periodicity in Properties

Solution:

Correct answer is (c) Both (a) and (b)