An element X has mass number 23 and atomic number 11.
a) State the number of protons in its nucleus
b) State the number of neutrons in its nucleus
c) State the number of electrons revolving around the nucleus.
d) Draw the atomic structure.

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Solution

a) Since the atomic number is given as 11, the number of protons will be also 11. The atomic number is the number of protons present inside the nucleus of an atom.
b)The mass number is given as 23.
The mass number is the sum of a number of protons and neutrons. Hence number of neutrons=mass number-number of protons=(23 -11)=12.
c)Number of electrons in a neutral atom will be equal to the number of protons. Hence, the number of electrons in X=11.
d ) )

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Similar questions

An element X has mass number 23 and atomic number 11

state the number of neutrons in its nucleus.

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

Q. An atom of an element contains

13

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neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass

2

units higher. What will be the number of protons, neutrons and electrons in the isotope?

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An element X has mass number 23 and atomic number 11.a) State the number of protons in its nucleusb) State the number of neutrons in its nucleusc) State the number of electrons revolving around the nucleus.d) Draw the atomic structure.

An element X has mass number 23 and atomic number 11.
a) State the number of protons in its nucleus
b) State the number of neutrons in its nucleus
c) State the number of electrons revolving around the nucleus.
d) Draw the atomic structure.