What's the number of protons, neutrons, and electrons in an atom of aluminum-27? Why?

Answer 1

The atomic number of Aluminum is 13 (look at a periodic table). This means 13 protons and 13 electrons (since these are oppositely charged they have to balance each other.) To find the number of neutrons you subtract the number of protons from the atomic mass (the atomic mass is 27). So 27-13= 14 neutrons

Answer 2

13 protons, 13 electrons, and 14 neutrons. I don't understand what you mean by "why"
The chemical properties of an element, which is what makes an atom of aluminum an atom of aluminum, are determined by the number and arrangement of electrons, 13 in the case of aluminum. In a neutral atom, which is what your question implies, the number of protons is always equal to the number of electrons. You specified a mass no. of 27, so 27 - 13 = 14.

Answer 3

Protons=13
Electrons=13
Neutrons-14

Answer 4

just look at your periodic table. the number of the element is the number of protons (that is what makes it that element). In the nuetral state #protons=#electrons. aluminum 27 has atomic weight of 27. electrons don't weigh much at all. protons/neutrons weigh~1. so 27-#protons = #neutrons.

Answer 5

the number of proton is 13 while the number neutron is 13 due to the periodic table, electrons is an atom of alumium 27 why because of the number of it proton.