How do valence electrons cause atoms to react or combine chemically

1. Generally speaking, where on the periodic table are the elements that form ions requiring! Roman numeral in their names?

Consider the equation: 2 nan3 (s) 2 na (s) + 3 n2. what is the mass of nan3 needed to produce 17.2 l nitrogen at stp?

Copper has an atomic number of 29. that means that there are 29 protons in the nucleus of each copper atom. That's what the atomic number is; the number of protons in an atom of a certain element.

Is a strap of leather a pure substance

The pH scale is called the logarithmic scale what does this mean?

Sprite: When mixed with red cabbage water, resulting solution turned red. Watermelon juice: When mixed with red cabbage water, resulting solution turned pink/purple. Egg whites: When mixed with red cabbage water, resulting solution turned green.

Uranium - 235 is used in nuclear fission. determine the number of protons and neutrons in uranium - 235

Calculation of Percent Composition Analysis of a 12.04-g sample of a liquid compound composed of carbon, hydrogen, and nitrogen showed it to contain 7.34 g C, 1.85 g H, and 2.85 g N. What is the percent composition of this compound?

A substance is tested with litmus paper. the blue litmus paper remains blue while the red litmus paper remains red. what can you conclude about the substance?

The density of iron = 7.86 g/cm^3, what is the volume of 150g of iron