H2 +Cl2 gives 2HCl
here in the product, we have HCl as a compound, with valency 1 from hydrogen and chlorine and hence is balanced as 2HCl.
but why do we write H two and Cl two, i can see its got nothing to do with valency, so what is it? do different elements have a fixed number of those things? if so where can i find such a list for different elements?
Pleeze help!!
2007-08-01 04:18:54 · 3 answers · asked by merrick 2 in Science & Mathematics ➔ Chemistry
In a molecule all the atoms must have the valence shell full or empty.
If you have the atom H hydrogen, this atom has only one electon on the shell K . so it can not exist isolated and must form a covalent compound with an other hydrogen atom to form molecule H2 which is stable. A similar thing exists with Cl. Most gases must form a molecule with 2 atoms. An important difference with inert gases such as helium, neon ..which have only one atom in the molecule ex : He is a gaz
2007-08-01 04:32:06 · answer #1 · answered by maussy 7 · 0⤊ 0⤋
hydrogen and chlorine are both considered diatomic atoms, which means they come in pair so you have to write it as H2 or Cl2...there are seven diatomic elements in the periodic table: H2, O2, Cl2, F2, I2, N2, and Br2.
2007-08-01 11:44:51 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Hydrogen gas and chlorine gas exist under standard conditions as diatomic molecules. That is, they are chemically bound as pairs of atoms.
Done.
2007-08-01 12:39:29 · answer #3 · answered by Jerry P 6 · 0⤊ 0⤋