Question

Like alkali metals hydrogen also forms ________

Answer 1

As we know that in chemistry, periodic tables play a vital role. In the periodic table there are totally $118$ elements. In the periodic table there are totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, totally $7$ period in the table. Hydrogen and oxygen are the one of the elements in the periodic table. Hydrogen is the first element in the periodic table. The atomic number of hydrogen is $1$. The symbol of hydrogen is ${\text{H}}$. The mass number of hydrogen is $1$. The atomic number of the element is nothing but the number of electrons or number of protons. The mass number of the atom is nothing but the sum of the number of protons and number of neutrons.

Complete answer:
Like alkali metals hydrogen also forms oxides, halides and sulphides.
The alkali oxides, alkali halides and alkali sulphides are stable due to the stable oxidation state. Because the alkali metals are naturally unstable. Alkali metals are present in the first group in the periodic table.

Note:
We need to know that the same atom number but different mass number of the atom is known as isotopes. Hydrogen having three isotopes. There are protium, deuterium and tritium. All the three having the same atomic number is$1$. But the mass numbers of three isotopes are different. The mass number of protium is $1$. The mass number of deuterium is$2$. The mass number of tritium is $3$. These difference mass numbers arise due to the difference in the number of neutrons but the number of protons of all isotopes are the same.