What is the smallest piece of an element? O A. A speck
O B. A molecule
C. An atom
D. A crystal

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons