How many electrons would be present in the valence shell of a sulfur atom (atomic number 16, mass number 32)?

There are __________ naturally occurring elements.

An element has eight protons, nine neutrons, and eight electrons. Its atomic number and atomic mass, respectively, are __________.

An uncharged atom of nitrogen (atomic number = 7) has __________.

What are the six most important chemical elements of life?

In the term trace element, the adjective trace means thata. the element is required in very small amounts.b. the element can be used as a label to trace atoms through an organism's metabolism.c. the element is very rare on Earth.d. the element enhances health but is not essential for the organism's long-term survival.

Fill in the blanks in this concept map to help you tie together the key concepts concerning elements, atoms, and molecules.

We can be sure that a mole of table sugar and a mole of vitamin C are equal in theira. mass.b. volume.c. number of atoms.d. number of molecules.