The atomic number of calcium (ca) is 20, and it's mass number is 40. what is true about the subatomic particles that make up a neutral atom of calcium?
a) it has 20 protons, 20 neutrons and 20 electrons.
b) the total number of subatomic particles in ca is 40.
c) the number of electrons cannot be determined from the information given.

A. It has 20 protons, 20 neutrons and 20 electrons

Explanation: The atomic number of an atom is equal to the number of protons inside the nucleus. In a neutral atom the number of electrons and protons are equal.

The number of neutrons can be determined by this formula

Atomic Mass - Atomic Number = n

40 - 20 = 20 neutrons

Protons = 20

Electrons = 20

Neutrons = 20

a basic solution is an aqueous solution containing more oh-ions than h+ions. in other words, it is an aqueous solution with a ph greater than 7. basic solutions contain ions, conduct electricity, turn red litmus paper blue, and feel slippery to the touch.

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.