State whether the following statements are True or False. Correct the false statement:

(a) An atom as a whole is electrically neutral.

(b) Mass of atom is distributed evenly within it.

(c) An electron has same mass as that of proton.

(d) The K shell has maximum energy.

(e) Isotopes have same atomic number but different atomic mass number.

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Solution

(a) True

(b) False

The correct statement is:

Mass of an atom is concentrated in the nucleus.

(c) False

The correct statement is:

An electron has less mass than a proton.

(d) False.

The correct statement is:

The K shell has minimum energy.

(e) True

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Similar questions

Q. Statement: Isotopes have same atomic number but different atomic mass number.

State whether the given statement is true or false.

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

State whether the following statements are true or false :
(a) A sodium ion has positive charge because it has more protons than a neutral atom.
(b) A chloride ion has negative charge because it has more electrons than a neutral atom.

Write 'true' or 'false' for the following statements :

(a) An atom on the whole has a positive charge.

(b) The maximum number of electrons in the first shell can be 8.

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.

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(a) True (b) False The correct statement is: Mass of an atom is concentrated in the nucleus. (c) False The correct statement is: An electron has less mass than a proton. (d) False. The correct statement is: The K shell has minimum energy. (e) True

(a) True

(b) False

The correct statement is:

Mass of an atom is concentrated in the nucleus.

(c) False

The correct statement is:

An electron has less mass than a proton.

(d) False.

The correct statement is:

The K shell has minimum energy.

(e) True