Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

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Define valency.

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Important Questions on Structure of Atom

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The pair of valencies exhibited by tin

(Sn)

is

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Valence electron in

{Cl}^{-}

ions is

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The half-life of a radioisotope is

4

hours. If the initial mass of the isotope was

200 g

, the mass remaining after

24

hours undecayed

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

An element X with atomic number

13

combines with another element Y of atomic number

17

. The formula of the compound formed and the nature of the bond will be:

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Hydrogen contains three types of atoms (

{}_{1}^{1}H

protium,

{}_{1}^{2}H

deuterium,

{}_{1}^{3}H

tritium). These atoms are

HARD

Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The formulae of an oxide of an element

M

is

MO

. The formulae of its phosphate is

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Which one of the following is cation

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Isotopes of an element contains

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The following is the correct decreasing order of the ionic radii-

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The number of protons in one atom of an element

X

is

8

. What will be the number of electrons in its ion

X^{- 2}

?

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

A positively charged body has

EASY

Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Define valency.

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Give one phrase for the following statement:

Process of formation of ions from molecules which are not in the ionic state.

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Isotopes have the same chemical properties but different physical properties. Explain.

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

What is the valency of Fluorine?

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Oxygen has three isotopes:

{}^{16}O, {}^{17}O, {}^{18}O

. How do the atoms of these isotopes differ?

EASY

Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Give a reason for different atomic masses of the isotopes of an element.

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

A Positively charged ion is also called?

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

The electrons present in the outermost shell of an atom are known _____ .

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Science>Chemistry>Structure of Atom>Isotope, Formation of Ion, Valency

Write brief notes on: isotopes.