The shortest period in the modern periodic table contains only two elements i.e, hydrogen and .

helium

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neon

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lithium

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berylium

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Solution

The correct option is A helium
The shortest period in the modern periodic table contains only two elements i.e, hydrogen and helium. This is the first period in the periodic table.

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Question 4
Which of the following statement(s) about the Modern Periodic Table are incorrect?

(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number

(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses

(iii) Isotopes are placed in adjoining group (s) in the Periodic Table

(iv)The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number

(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only

Q. Which of the following series in the periodic table contains only radioactive elements?

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The shortest period in the modern periodic table contains only two elements i.e, hydrogen and .

The correct option is A heliumThe shortest period in the modern periodic table contains only two elements i.e, hydrogen and helium. This is the first period in the periodic table.

The correct option is A helium
The shortest period in the modern periodic table contains only two elements i.e, hydrogen and helium. This is the first period in the periodic table.