# If an element has 56 protons, 82 neutrons, and 56 electrons, what are its symbol and mass number? ?

0

How is an atom with 56 protons and 78 neutrons and 56 electrons related to the atom with the 82 neutrons?

• They’re both called Barium because they both have 56 protons, but they’re different isotopes. The number of protons will always tell you what element it is; the only difference here is their atomic weight (the sum of their protons and neutrons). If you’re interested in the different chemical properties of Barium 138 and Barium 134, I suggest the “Isotopes of Barium” page on www.wikipedia.org as a good jumping off point.

• The element is Barium

mass number = protons + neutrons = 56 + 78 = 134

• Element 82

• 56*1 + 82*1 = 138 is the mass.

56*1 + 56*(-1) = 0 is the charge.

56 is the order.

• Atomic quantity is the style of protons. which would be 26. Atomic mass = style of protons + style of neutrons = 26 + 30 = fifty six. internet cost = style of protons – style of electrons = 26 – 23 = +3 so as meaning the respond is A.

• mass no 138….symbol Ba

Also Check This  is cyclops capitalized? 