Which element has an atomic number 10 and an atomic mass of 20

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

Which best describes how johannes kepler developed his laws of planetary motion

Helium decays to form lithium. which equation correctly describes this decay?