Atoms form a new substance by bonding with different atoms.
For example, hydrogen atoms and oxygen atoms bond to form H2O as per this equation:
2H2 + O2 ---> 2 H2O
To understand how to hydrogen and oxygen atoms form water you can write that as:
2 H - H + O - O ---> 2 H - O - H
Each hypen represent a chemical bond.
What is happening is that the H - H atoms and the O - O separate and bond with different atoms: H bonds to O which in turn bonds to other H.
Also, you have to know that chemical bonds are the result of interaction between the electrons of the valence shell of electrons of each atom. This is, valence electrons from O interact with valence electrons of H to form the bond H - O.
The interaction may be in different ways depending on the properties of the atoms: the kind of bonds known are metallic, ionic and covalent.
Before a number but after a decimal. The zeros at the end would usually mean that it doesn't count but since the numbers are before the zeros and after a decimal it's 7 sig figs
The correct option is Moseley who has discovered the atomic number.
<em>Explanation:</em>
In 1913, H. Moseley discovered a new properties of an element atomic number. He observed that elements in the periodic table can be arranged better according to atomic number rather than atomic mass.
The atomic number of any elements is always equal to numbers of electrons in it.
