According to the Periodic Table of Elements, Calcium has:

A. 20 protons and 20 electrons

B. 40.08 protons

C. 20 protons and 20.08 electrons

D. 20 protons and zero electrons

Does The human brain retains more information than all the books in the Library of Congress

What scientist developed a model of the atom that looked like a nucleus surrounded by electrons

Count the total number of atoms in H2O:

What happens to the size of the atom of anon-metal as it becomes an anion? A. it decreases B. it increases C. it remains the same D. it is impossible to tell unless you know the specific element

Consider the four salts represented on the solubility curves displayed as line graphs. In all four cases the water is which part of an aqueous solution?

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth? • They are falling toward Earth at the same rate as the space shuttle.

If increase the amplitude how does the velocity change? (No google)

What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

What is 0.002353 to two significant figures

10. Is the identity of an element determined by its mass number or atomic number? By omak