If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom?
I. Its isotope is formed.
II. Its location in the periodic table does not change.
III. Its mass number decreases.

I,II are correct

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Only I is correct

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Only II is correct

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All are correct.

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Solution

The correct option is D All are correct.
If an atom does 1 alpha decay, its mass number decreases 4 and atomic number decreases 2.
If an atom does 2 beta decay, mass number of it does not change but its atomic number increases 2.
To sum up, mass number of this atom decreases 4 and atomic number does not change. Since number of protons does not change, location in the periodic table also does not change. Is mass number decreases and its isotope is formed. I, II and III are true.

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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. Consider following statement:
(I) In diamond, each carbon atom is linked tetrahedrally to four other carbon atoms by

s p^{3}

bonds.
(II) Graphite has planar hexagonal layers of carbon atoms held together by weak vander walls forces.
(III) Silicon exists only in diamond structure due to its tendency to form

p π - p π

bonds to itself.

Choose the correct option.

Read the following and select one the correct answer.

Statement I: Boron always forms covalent bond

Statement II: The small size of $B^{3 +}$ favours formation of covalent bond

Read the following and select one the correct answer.

Statement I: $P b^{4 +}$ compounds are stronger oxidizing agents than $S n^{2 +}$ compounds

Statement II: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to inert pair effect.

Q. Statement I : Moseley's plot of square root of frequency vs the position number of elements in periodic table inspired the periodicity to be defined in terms of atomic number instead of atomic weight.
Statement II : According to Moseley's law , the frequency of

K_{α}

Characteristic x-ray increased with atomic number instead of atomic weight, and he concluded that atomic number is the fundamental quantity which increases in regular steps as one moves from one element to other.

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If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom? I. Its isotope is formed. II. Its location in the periodic table does not change. III. Its mass number decreases.

If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom?
I. Its isotope is formed.
II. Its location in the periodic table does not change.
III. Its mass number decreases.