Atomic number of Mg is 12 and its mass number is 24. How many protons and electrons does a `Mg^2+` ion have?

I have a total of Rs 300 in coins of denomination Rs 1, Rs 2 and Rs 5, the number of Rs 2 coins is 3 times the numbers of Rs 5 coins. The total number of coins is 160. How many coins of cash denomination are with me?

What is the number of unpaired electrons in Fe^(2+) ion (ferrous ion)?

The atomic number of an element X is 20 while the atomic number of an element Y is 24.What is the nature of the bond formed between X and Y?Give the electron-dot structure of the compound formed.

Name the primary acceptor of carbon dioxide in C_4 plants. How many carbon atoms does it have?

Predict the number of unpaired electrons in the square planer [Pt(CN)_4]^(2-) ion.

The unit of length convenient on the nuclear scale is a fermi : 1 f = 10^(-15) m. Nuclear sizes obey roughly the following empirical relation : r = r_0A^(1/3) where r is the radius of the nucleus, A its mass number, and r_0 is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise. 2.27.

Name the compound Calvin detected as the first product of photosynthesis. How many carbon atoms does it have?