The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.

What are the 20 first elements?

These are the first 20 elements, listed in order:
H – Hydrogen.He – Helium.Li – Lithium.Be – Beryllium.B – Boron.C – Carbon.N – Nitrogen.O – Oxygen.

What are the 20 elements of metal?

Metals in the first twenty elements are Lithium, Beryllium, Sodium, magnesium, Aluminum, Potassium, and calcium. Now the non-metals in the first twenty elements are Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorous, Sulphur, Chlorine, and Argon.

What are the 20 most common elements?

Most common 20 elements are: H, He, C, N, O, Na, Al, Si, S, Cl, K, Ca, Fe, Ni, Cu, Zn, Ag, Sn, Hg, Au.

How can I remember the first 20 elements?

Silly Patrick Stays Close. Arthur Kisses Carrie. Here He Lies Beneath Bed Clothes, Nothing On, Feeling Nervous, Naughty Margret Always Sighs, ” Please Stop Clowning Around ” (18 elements)

Hydrogen -H.Helium -He.Lithium -Li.Beryllium -Be.Boron -B.Carbon -C.Nitrogen -N.Oxygen -O.

Which of the first 20 elements in the periodic table has atoms with greatest mass?

Answer. Explanation: Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth’s crust.