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11.

The antiparticle of electron is

A.	proton	B.	positron
C.	antiproton	D.	neutron

12.

The number of protons in the nucleus 92U235 is

A.	327	B.	92
C.	235	D.	143

13.

The number of neutrons in the nucleus 92U235 is

A.	92	B.	146
C.	143	D.	327

14.

Anions are formed from neutral atoms by

A.	loss of electrons	B.	loss of protons
C.	gain of electrons	D.	gain of protons

15.

The ?-particle is identical with

A.	a helium atom	B.	a doubly charged helium ion
C.	proton	D.	fast moving neutron

16.

Which of the following particles is unstable?

A.	neutrons	B.	proton
C.	electron	D.	alpha particle

17.

The neutron carries

A.	no electric charge	B.	a single positive charge
C.	a single negative charge	D.	double negative charge

18.

The mass of helium is about

A.	half of the mass of neutron	B.	one-fourth of the mass of proton
C.	twice the mass of deuterium	D.	same as the mass of tritium

19.

An atom can be considered as having a dense nucleus of neutrons and protons and a surrounding distribution of electrons. If there are x neutrons y protons and z electrons what sort of relationship exists between x y and z in a small neutral atom? Where ? means approximately equals.

A.	x = y ? z	B.	x ? y = z
C.	x = y = z	D.	x = y-1 = z

20.

Select the correct statement

A.	The nucleus is an elementary particle	B.	The nucleus has a structure
C.	The nucleus cannot have different states of energy	D.	Some radioactive muclei emit only ?-rays and ?-rays