isotope copyright e 20 ? ?.ufornia Depennent or Educ.ion 1. All of the following

Question

isotope copyright e 20 ? ?.ufornia Depennent or Educ.ion 1. All of the following are true except: a) An ion has a positive or negative charge. b) Metals tend to form positive ions. c) Ions are formed by adding electrons to a neutral atom. d) Ions are formed by changing the number of neutrons in an atom's nucleus e) Ions are formed by removing electrons from a neutral atom. Which one of the following statements about atomic structure is false? a) The electrons occupy a very large volume compared to the nucleus. b) Almost all of the mass of the atom is concentrated in the nucleus. C The number of protons and neutrons is always equal for all atoms of a . d) Electrons are in quantized energy levels. e) The protons and neutrons in the nucleus are very tightly packed.

Explanation / Answer

1. The answer is D

Ions are formed by adding or removal of electron from a neutral atom but not added to nuetrons. neutrons are present in nucleous.

M + e- -------------------- M-

M ---------------------- M+ + e-

2) The answer is C.

The number of protons are not equal to number of neutrons in an atom.This is possible very limited atom.

for example

In Sodium atom

atomic number of Sodium = 11,

mass of number of sodium = 23

so number of neutrons = mass number - number of protons

number of neutrtons = 23 - 11 = 12.

So number of neutrons is not equal to number of protons.

But in case of Carbon,

atomic number of carbon=6

mass number of carbon =12

number of neutrons = 12-6 = 6

so number of nuetons is equal to number of protons.

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