Which element is a metal on the peridoc table;

This question is ambiguous or might not be complete

Explanation:

Generally, the periodic table is divided into 4 blocks; the s-block, p-block, d-block and the f-block.

The elements found in the s and d blocks are generally metals. Group 1 and 2 (1A and 2A as shown in the image attached) are the groups in the s-block. Elements in group 1 are called alkali metals while elements in group 2 are called alkali earth metals. Elements in the d-block (all the elements between 2A and 3A in the image attached) are called transition metals.

Some metals are also found on the p-block, they are called basic metals (shaded purple in the image attached).

Aside from the above, other elements on the periodic table are either semi-metals (found on the p-block between the basic metals and non-metals), non-metals (also found on the p-block) or radioactive elements (found on the f-block).

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.