(A) An alpha particle is a helium nucleus,represented as ${ }_{2}^{4} He ^{2+}$.$1$. The atomic number $(Z)$ of helium is $2$,which indicates the numb

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Electrons: $0$,Protons: $2$,Neutrons: $2$

(A) An alpha particle is a helium nucleus,represented as ${ }_{2}^{4} He ^{2+}$.$1$. The atomic number $(Z)$ of helium is $2$,which indicates the number of protons is $2$.$2$. The mass number $(A)$ is $4$. The number of neutrons is calculated as $A - Z = 4 - 2 = 2$.$3$. $A$ neutral helium atom has $2$ electrons. Since the alpha particle has a charge of $+2$,it has lost $2$ electrons. Therefore,the number of electrons is $2 - 2 = 0$.

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

Medium

Find the number of electrons,protons,and neutrons possessed by the alpha particles $\left({ }_{2}^{4} He ^{2+}\right)$ used in the gold leaf experiment.

A
Electrons: $0$,Protons: $2$,Neutrons: $2$
B
Electrons: $2$,Protons: $2$,Neutrons: $2$
C
Electrons: $0$,Protons: $2$,Neutrons: $4$
D
Electrons: $2$,Protons: $2$,Neutrons: $4$

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STRUCTURE OF THE ATOM

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Mix Example - STRUCTURE OF THE ATOM

$(a)$ Explain Bohr$-$Bury rules for the distribution of electrons into different shells.
$(b)$ Write the electronic configuration of an atom of sulphur. Also,draw a schematic diagram of its atom showing the distribution of electrons in its shells.

Medium

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Who discovered the neutron?

Easy

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What information do you get from the figure about the atomic number,mass number,and valency of atoms $X$,$Y$,and $Z$? Give your answer in a tabular form.

Medium

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Give one point of similarity and one point of difference between isotopes of ${ }_{6}^{14} C$ and ${ }_{6}^{12} C$.

Medium

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Give reasons for the following:
$(a)$ Isotopes of an element are chemically similar.
$(b)$ An atom is electrically neutral.
$(c)$ Noble gases show least reactivity.
$(d)$ Nucleus of an atom is heavy and positively charged.
$(e)$ Ions are more stable than atoms.

Medium

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Find the number of electrons,protons,and neutrons possessed by the alpha particles $\left({ }_{2}^{4} He ^{2+}\right)$ used in the gold leaf experiment.

Similar Questions

$(a)$ Explain Bohr$-$Bury rules for the distribution of electrons into different shells.$(b)$ Write the electronic configuration of an atom of sulphur. Also,draw a schematic diagram of its atom showing the distribution of electrons in its shells.

Who discovered the neutron?

What information do you get from the figure about the atomic number,mass number,and valency of atoms $X$,$Y$,and $Z$? Give your answer in a tabular form.

Give one point of similarity and one point of difference between isotopes of ${ }_{6}^{14} C$ and ${ }_{6}^{12} C$.

Give reasons for the following:$(a)$ Isotopes of an element are chemically similar.$(b)$ An atom is electrically neutral.$(c)$ Noble gases show least reactivity.$(d)$ Nucleus of an atom is heavy and positively charged.$(e)$ Ions are more stable than atoms.

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$(a)$ Explain Bohr$-$Bury rules for the distribution of electrons into different shells.
$(b)$ Write the electronic configuration of an atom of sulphur. Also,draw a schematic diagram of its atom showing the distribution of electrons in its shells.

Give reasons for the following:
$(a)$ Isotopes of an element are chemically similar.
$(b)$ An atom is electrically neutral.
$(c)$ Noble gases show least reactivity.
$(d)$ Nucleus of an atom is heavy and positively charged.
$(e)$ Ions are more stable than atoms.