Question

write atomic no. and atomic mass
of all the elements ​

Answer 1

Answer:

The number of protons determines an element's atomic number and is used to distinguish one element from another. Together, the number of protons and the number of neutrons determine an element's mass number.

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Answer 2

Answer:

Atomic mass of first 20 elements:

Hydrogen (H) : 1u

Helium (He) : 4u

Lithium (Li) 7u

Beryllium (Be) : 9u

Boron (B) : 11u

Carbon (C) : 12u

Nitrogen (N) : 14u

Oxygen (O) : 16u

Fluorine (F) : 19u

Neon (N) : 20u

Sodium (Na) : 23u

Magnesium (Mg) : 24u

Aluminum (Al) : 27u

Silicon (Si) : 28u

Phosphorus (P) : 31u

Sulphur (S) : 32u

Chlorine (Cl) : 35.5u

Argon (Ag) : 40u

Potassium (K) : 39u

Calcium (Ca) : 40u

Explanation: