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Ca has atomic no. 20 and atomic weight 40. Which of the following statements is not correct about Ca atom

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Important Questions on Structure of Atom

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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The number of protons, neutrons and electrons in 71175Lu, respectively, are
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Be2+ is isoelectronic with which of the following ions?
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The number of electrons, protons and neutrons in a species are equal to 10,11 and 12 respectively. The proper symbol-of the species is
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
In the nuclear reaction Al2713+He42⟶X3014+H11,X is
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The isoelectronic pair is:
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
An element with mass number 181 contains 32% more neutrons as compared to protons. What is the symbol of that element?
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Hydrogen has three isotopes A, B and C. If the number of neutron(s) in A, B and C respectively, are x, y and z, the sum of x, y and z is
HARD
Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Consider a hypothetical case in which the charge of a proton is twice as that of an electron. Using this hypothetical case, how many protons P, neutrons N and electrons E would a neutral Na23 atom contain?
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Among the following, the set of isoelectronic ions is
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
O2- is isoelectronic with
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Isotopes are
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Among the following species which option contains all isoelectronic species?
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The product obtained after a positron emission from Ga6831 is
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms

Which of the following are isoelectronic species?

I. C+H3

II. NH2-

III. NH4+

IV. NH3

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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
In the following sets of ions, which one is not isoelectronic with the rest of the species?
MEDIUM
Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The number of protons, neutrons and electrons in C613 respectively are
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
From the following pairs of ions which one is not an iso-electronic pair?
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The isoelectronic set of ions is:
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Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
The pair of atoms having the same number of neutrons is
MEDIUM
Chemistry>Physical Chemistry>Structure of Atom>Some Important Atomic Terms
Which of the following pairs of iron are isoelectronic and isostructural?