Which of the following atoms would gain two electrons to fill its valence energy level?

A. Ca

B. Br

C. S

D. B

Why is geography considered a science

Four physical properties of 500g of butter

Where are atoms that tend to gain electrons located in the periodic table of the elements? A. on the left side B. on the right side C. in the middle columns D. starting on the fourth row

1) Write the word and symbol equation to show what happens when water is added to Calcium Oxide. 2) Write word and symbol equations for the thermal decomposition of limestone.

1. What is mitosis? 2. Why is mitosis important to all living things? 3. What are the four phases of mitosis? 4. At what phase of the cell cycle does the genetic material double? 5. At what phase of mitosis does the number of chromosomes double? 6.

What is an Element and how it different from a Atom?

4 HCI + O2 - > 2 H2O + 2 CH2 How many moles of H2O can be produced from 30. moles of HCI?

How many molecules of nitrogen gas are in 22.4 L? A. 6.022 * 10^22 B. 6.022 * 10^23 C. 6.022 * 10^24 D. 6.022 * 10^25

What is the pH of a 0.0025M HCI solution?

Moles of Zn (NO3) 2 in 131.50g of this substance.