Why is the number 2? Please explain
1 answer:
Answer:
He (helium, that is) has 2 protons in its nucleus.
Explanation:
The placement of numbers around an element's symbol can be confusing. Generally, an element symbol written in this format has the atimic mass in the upper left and the element number on the lower left. The upper right is the lement's charge, zero in the is case because there are two electrons and two protons, for a net charge of zero.
Some symbols will include additional information, such as electron configuration. Be aware of a publication's standard for the notation style used.
You might be interested in