(C) Isotopes are atoms of the same element that have the same atomic number (number of protons and electrons) but different mass numbers.The differenc

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The two oxygen atoms are isotopes

(C) Isotopes are atoms of the same element that have the same atomic number (number of protons and electrons) but different mass numbers.The difference in mass number arises because isotopes have a different number of neutrons in their nuclei.Since oxygen atoms in a sample can exist as different isotopes (e.g.,$^{16}O$,$^{17}O$,or $^{18}O$),they will have the same number of electrons but a different number of neutrons.

Class 9 Science STRUCTURE OF THE ATOM Mix Example - STRUCTURE OF THE ATOM

Easy

In a sample of ethyl ethanoate $(CH_3COOC_2H_5)$,the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

A
One of the oxygen atoms has gained electrons
B
One of the oxygen atoms has gained two neutrons
C
The two oxygen atoms are isotopes
D
The two oxygen atoms are isobars

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STRUCTURE OF THE ATOM

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Mix Example - STRUCTURE OF THE ATOM

Give reasons:
$(a)$ Mass number of an atom excludes the mass of an electron.
$(b)$ The nucleus of an atom is charged.
$(c)$ The alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.

Medium

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Which of the $Na^+$ and $He$ has completely filled $K$ and $L$ shells? Give a reason to support your answer.

Easy

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One electron is present in the outermost shell of the atom of an element $X$. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?

Easy

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Write down the electron distribution of chlorine atom. How many electrons are there in the $L$ shell? (Atomic number of chlorine is $17$).

Easy

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The isotope of uranium used as a fuel in nuclear reactors and carbon used in radiocarbon dating are

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In a sample of ethyl ethanoate $(CH_3COOC_2H_5)$,the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

Similar Questions

Give reasons:$(a)$ Mass number of an atom excludes the mass of an electron.$(b)$ The nucleus of an atom is charged.$(c)$ The alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.

Which of the $Na^+$ and $He$ has completely filled $K$ and $L$ shells? Give a reason to support your answer.

One electron is present in the outermost shell of the atom of an element $X$. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?

Write down the electron distribution of chlorine atom. How many electrons are there in the $L$ shell? (Atomic number of chlorine is $17$).

The isotope of uranium used as a fuel in nuclear reactors and carbon used in radiocarbon dating are

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Give reasons:
$(a)$ Mass number of an atom excludes the mass of an electron.
$(b)$ The nucleus of an atom is charged.
$(c)$ The alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.