Arun Syamal Solutions for Chapter: Atoms and Molecules, Exercise 3: Practice Questions

Valencies or the charge numbers of some ions are given below: 
Aluminium ion  $3$
Potassium ion  $1$
Sulphate ion  $2$
Magnesium ion $2$
Nitride ion   $3$
Fluoride ion $1$

Using the above information, write down the chemical formulae of Potassium nitride.

The valencies of some ions are as follows: zinc ion, $2$; phosphate ion, $3$; nitrogen, $3$; sodium ion, $1$; oxygen, $2$; bromide ion, $1$; lead ion, $2$. 
Using the above information, write down the chemical formulae of zinc phosphate.

The valencies of some ions are as follows: Zinc ion, $2$; Phosphate ion, $3$; Nitrogen, $3$; Sodium ion, $1$; Oxygen, $2$; Bromide ion, $1$; Lead ion, $2$. 
Using the above information, write down the chemical formulae of dinitrogen trioxide. 

The valencies of some ions are as follows: Zinc ion, $2$; Phosphate ion, $3$; Nitrogen, $3$; Sodium ion, $1$; Oxygen, $2$; Bromide ion, $1$; Lead ion, $2$. 
Using the above information, write down the chemical formulae of sodium phosphate.

The valencies of some ions are as follows: Zinc ion, $2$; Phosphate ion, $3$; Nitrogen, $3$; Sodium ion, $1$; Oxygen, $2$; Bromide ion, $1$; Lead ion, $2$. 
Using the above information, write down the chemical formulae of lead$\left(\mathrm{ll}\right)$ bromide.

John Dalton's most outstanding contribution to chemistry was a scientifically grounded atomic theory. He even supplemented his atomic theory with theoretical values of atomic masses and atomic sizes which were found to be incorrect. This revealed discrepancy between his enthusiasm in chemistry and his inadequate training. He even did not consider Aristotle's suggestion of divisibility of atom.

What is the major disagreement of modern atomic theory with Dalton's atomic theory?

John Dalton's most outstanding contribution to chemistry was a scientifically grounded atomic theory. He even supplemented his atomic theory with theoretical values of atomic masses and atomic sizes which were found to be incorrect. This revealed discrepancy between his enthusiasm in chemistry and his inadequate training. He even did not consider Aristotle's suggestion of divisibility of atom.

What value can we learn from Dalton's supplementation of his atomic theory with theoretical values of atomic masses and atomic sizes of elements, which were found to be incorrect?

John Dalton's most outstanding contribution to chemistry was a scientifically grounded atomic theory. He even supplemented his atomic theory with theoretical values of atomic masses and atomic sizes which were found to be incorrect. This revealed discrepancy between his enthusiasm in chemistry and his inadequate training. He even did not consider Aristotle's suggestion of divisibility of atom.

What value can we learn from Dalton's non-consideration of Aristotle's view that an atom is subdivisible, which was later found to be correct?