an element has atomic number 10 and an atomic number mass of 20. How mamy neutrons are in the atom of this element?

Write a balanced nuclear equation for the Beta decay of: A. Nitrogen-16 B. Potassium-40

Calculate the number of grams of solute in 500.0 mL of 0.159 M KOH

What is a watershed? A. An area of land where all the water drains into the same place. B. The area around a river C. The area around a pond D. The groundwater below a river

What is the density of N2 gas (molar mass: 28 g/mol), at 400 K and 2 atm?

Major geological events that occur when plates shift suddenly and released stored energy: A. Volcanic eruptions B. Earthquakes C. Antarctic plate D. Spreading ridges

How many moles of ammonia are produced when 8 moles of nitrogen gas react with hydrogen gas?

If a mass of gas is confined in a closed container with a movable piston above the gas and a small downward force is applied to the piston, the volume of the gas will be a. increased considerably. b. reduced considerably. c. reduced slightly. d.

If an atom has 8 valence electrons, how many electrons does it need to gain to achieve a stable electron configuration?

About how many miles on Earth are equal to one degree of latitude?

What are the allotropes of sulphur And phosphorus?