State The Atomic Number And Mass Number Of First 20 Elements Of P.t Quiz

The correct chemical symbol for Hydrogen is 'H'. It is the first element in the periodic table with an atomic number of 1.

A Helium atom has 2 protons in its nucleus, hence it is represented by the atomic number 2 on the periodic table.

The atomic number of an element represents the number of protons found in the nucleus of an atom of that element. In the case of Lithium, the atomic number is 3, indicating it has 3 protons.

The atomic number of Beryllium is 4, which is represented by the chemical symbol Be in the periodic table. Atomic number corresponds to the number of protons in an atom's nucleus.

The atomic number of an element represents the number of protons in its nucleus. In the case of Boron, it has an atomic number of 11, which means it has 11 protons.

The atomic number of an element represents the number of protons in the nucleus of an atom of that element. In the case of Carbon, the atomic number is 6, which means it has 6 protons.

The atomic number of an element represents the number of protons in the nucleus of an atom. In the case of Nitrogen, the correct atomic number is 7, which indicates that a Nitrogen atom has 7 protons.

The atomic number of Oxygen is 8, which corresponds to its position on the periodic table. This number signifies the number of protons in the nucleus of an atom of Oxygen, which in turn determines its chemical properties.

Fluorine has an atomic number of 19, which corresponds to the number of protons in the nucleus of an atom of fluorine. This number defines the chemical properties of fluorine, such as its placement in the periodic table and reactivity.

The correct answer is 20 as Neon's atomic number is 20, which indicates the number of protons in the nucleus of an atom.

The atomic number of Sodium is 23, which means it has 11 protons in its nucleus. This determines its unique chemical properties.

The correct answer is 12 because the atomic number of Magnesium is 12, which indicates the number of protons in the nucleus of an atom of Magnesium.

The atomic number of Aluminium is 27, not 13, which is the atomic number of Aluminum. 40 and 52 are incorrect numbers.

The atomic number of Silicon is 28, which corresponds to its position on the periodic table. It has 14 protons and 14 electrons, giving it an atomic number of 28.

Phosphorus has an atomic number of 15, which is denoted by the symbol P. Atomic numbers represent the number of protons in an atom's nucleus.

The correct atomic number of Sulphur is 16 because it is the number of protons in the nucleus of an atom of Sulphur.

The atomic number of Chlorine is 17.5, represented by the chemical symbol Cl. It is the second-lightest of the halogens, which are nonmetals found in group 17 of the periodic table.

The atomic number of Argon is 18, which indicates the number of protons found in the nucleus of an atom of Argon. This atomic number defines the chemical properties of the element and its position on the periodic table.

The atomic number of an element represents the number of protons in the nucleus of an atom of that element. In the case of Potassium, the atomic number is 19.

The atomic number for Calcium is 20, which corresponds to the number of protons in its nucleus. This determines its unique chemical properties and its place in the periodic table.