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Standard VIII

Chemistry

Proton

A neutral ato...

Question

A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?

20 : 24

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10 : 13

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10 : 14

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27 : 13

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Solution

The correct option is B 10 : 13
Hydrogen nucleus has 1 proton (1 proton has 1 unit positive charge), which means this neutral atom has 13 units positive charge. If the mass of a hydrogen atom is 1 unit, then the mass of this neutral atom is 27 units. Since, for a neutral atom number of electrons = number of protons = 13. Now, for this neutral atom to form a stable positive ion, it must lose 3 electrons present in its valence shell to obtain stable configuration. Hence, its ion will have 10 electrons. Therefore, the ratio of electron to protons in the ion is 10:13.

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(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 ....................

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

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Q. A neutral atom of an element has a nucleus with a nuclear charge

13

times and mass

27

times as that of hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?

Q. A neutral atom of an element has a nucleus with nuclear charge

11

times and mass

23

times that of hydrogen. Find the ratio of no. of electrons to protons present in its stable ion.

Q. A neutral atom of an element with nuclear charge 11 times and mass 23 times that of hydrogen. Find the ratio of electrons to protons present in its stable ion.

Q. A neutral atom of an element has a nucleus with nuclear charge

11

times and mass

23

times that of hydrogen. The element can form a stable charged ion by:

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A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?​

A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?