Question

1.The element 108/47 Ag has how many protons?
A.108
B.47
C.61
D.107
E.87

2.The element 238/92 U has how many neutrons?
A.330
B.238
C.184
D.146
E.92

Answer 1

  QUESTION 1

The number   of protons  are   47  protons (answer B)

  Explanation

Protons  are sub atomic particles  found in  nucleus of every  atom.  protons in element's nucleus is called  atomic    number.

In isotope notation  of an  element   atomic number  is written lower left of element symbol while  mass   number   is  written above .

Since      47  is written  on lower  left   in 108/47 Ag,  it is the number of  protons.

Question 2

               

The number  of  neutrons  =  146 ( answer D)

 

Explanation

number of   neutrons  =  mass  number -  number of  protons

In  isotope  notation  the mass  number is written on upper left  of  element  symbol  while  number of protons are  written  below .

Therefore  in 238/92  U ,  

238 = mass number

 92 =  number of protons/ atomic  number

Number  of protons is therefore = 238-92  = 146 (answer D)