20
Calcium has 20 protons and electrons and a variable number of neutrons, depending on the isotope.
Electrons have no relevant mass, and protons and neutrons both have the mass of 1u. If Calcium has the number 20, it has 20 protons (and electrons). It's mass is about 40u. Core Mass - Protons = Neutrons 40u - 20u = 20u, this means Calcium has 20 electrons, 20 protons and 20 neutrons.
A positive two ion of calcium will have 20 protons, 18 neutrons, and 18 electrons. The number of protons and neutrons in a calcium ion remains the same as in a neutral calcium atom (calcium has 20 protons and about 20 neutrons in its nucleus), but it loses two electrons to become positively charged.
Calcium has 20 protons and electrons and a number of neutrons different for each isotope..
Calcium has 20 protons, 20 electrons and 20 neutrons in its most commonly found isotope.
20 protons, 20 electrons, and usually 20 neutrons
Calcium-48 has 20 protons, 28 neutrons, and 20 electrons. The number of protons defines the element as calcium, while the mass number (48) is the sum of protons and neutrons, indicating it has 28 neutrons (48 - 20 = 28). Since it is a neutral atom, the number of electrons equals the number of protons.
There are 20 p , n , e- in an atom of calcium. Its atomic number is also 20.
A calcium atom typically has 20 protons, 20 electrons, and approximately 20 neutrons.
Calcium atoms have 20 protons and 20 electrons. The number of neutrons varies with the isotope.
Calcium has 20 protons, 20 electrons and 20 neutrons in its most commonly found isotope.
1) it's spelt Calcium and 2) 20 protons, 20 electrons, 20 neutrons