(A) An atom is electrically neutral because it contains an equal number of positively charged protons and negatively charged electrons. While the numb

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An atom has an equal number of electrons and protons.

(A) An atom is electrically neutral because it contains an equal number of positively charged protons and negatively charged electrons. While the number of neutrons can vary (leading to isotopes),the number of protons and electrons must be equal for the atom to remain neutral.

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

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Which of the following statements is always correct?

A
An atom has an equal number of electrons and protons.
B
An atom has an equal number of electrons and neutrons.
C
An atom has an equal number of protons and neutrons.
D
An atom has an equal number of electrons,protons,and neutrons.

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STRUCTURE OF THE ATOM

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Mix Example - STRUCTURE OF THE ATOM

The ion of an element has $3$ positive charges. The mass number of the atom is $27$ and the number of neutrons is $14$. What is the number of electrons in the ion?

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$(a)$ Both helium and beryllium have two electrons in their valence shells. Helium is a noble gas whereas beryllium is a metal. Justify.
$(b)$ Hydrogen exists in three isotopic forms. Why are the isotopes of hydrogen chemically alike?

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Elements with valency $1$ are

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Write the charge and mass of an electron.

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$(a)$ How many neutrons are present in $C-14$ isotope of carbon?
$(b)$ How many protons does $He^{2+}$ ion possess?
$(c)$ How many maximum electrons can be filled in the $3^{rd}$ orbit of an atom?
$(d)$ How many electrons does $He^{2+}$ ion possess?

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Which of the following statements is always correct?

Similar Questions

The ion of an element has $3$ positive charges. The mass number of the atom is $27$ and the number of neutrons is $14$. What is the number of electrons in the ion?

$(a)$ Both helium and beryllium have two electrons in their valence shells. Helium is a noble gas whereas beryllium is a metal. Justify.$(b)$ Hydrogen exists in three isotopic forms. Why are the isotopes of hydrogen chemically alike?

Elements with valency $1$ are

Write the charge and mass of an electron.

$(a)$ How many neutrons are present in $C-14$ isotope of carbon?$(b)$ How many protons does $He^{2+}$ ion possess?$(c)$ How many maximum electrons can be filled in the $3^{rd}$ orbit of an atom?$(d)$ How many electrons does $He^{2+}$ ion possess?

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$(a)$ Both helium and beryllium have two electrons in their valence shells. Helium is a noble gas whereas beryllium is a metal. Justify.
$(b)$ Hydrogen exists in three isotopic forms. Why are the isotopes of hydrogen chemically alike?

$(a)$ How many neutrons are present in $C-14$ isotope of carbon?
$(b)$ How many protons does $He^{2+}$ ion possess?
$(c)$ How many maximum electrons can be filled in the $3^{rd}$ orbit of an atom?
$(d)$ How many electrons does $He^{2+}$ ion possess?