Atom

There are four different metal halides-A, B, C and D. The ratio of the number of constituent atoms (i.e., metal and halogen atoms present) in one gram molecule of those metal halides are $1, 0.5, 0.25 \mathrm{and} 0.33$ respectively. Find the valency of the metals present in those metal halides. Give reasons in support of your answer.

One molecule of calcium phosphate reacts with silica and coke and gives rise to calcium silicate, phosphorus and carbon monoxide. Calculate the mass of carbon monoxide obtained. 

The table lists the symbols for some common elements

Choose the correct statement for the symbols of different elements?

Difference between Atoms and elements.

Atoms cannot been seen with eyes then, how can we say the exact number of electron in an atom?

What is atomic structure?

How we calculate atomic mass?

Why is some of the name of atom are given in Latin language?

What is the difference between atoms and particles

Why only carbon was chosen in relative mass?

Cations are electrically neutral particles which may or may not exist independently in a solution. 

What is the formula of sodium?

Among these atoms which is the particle that differs in number ?

Is matter and atom same?

Write the symbols of following elements: Beryllium, Carbon, Oxygen, Sodium, Silicon, Argon.

Explain why $\mathrm{C}-12$ is taken as a reference to compare the atomic mass of element?

What is atomic mass unit?

Which of the following is the SI unit of atomic mass unit?

Which of the following is taken as a reference to compare the atomic mass of element?

Define atomic mass.