Question

6. Choose from the table letters (A to E) that represent
(a) a pair of isotopes.
(b) an element with mass number 19.
(c) an element having atomic number 7.
Element
Neutron
Proton
Electron
А
22
18
18
B
18
17
17
C С
10
D
7
E
20
17
17
ive Chemistry-8​

Answer 1

Answer:

To form a solution, energy is required to break the bonds between the particles within the solid or liquid. Heat energy is also required to break the bonds in a solvent to insert one of the molecules into solution. Hence these processes are endothermic.

Explanation:

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Answer 2

Answer:

a)B and E

B)C

C)nitrogen but here is not in table

Explanation:

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