What is used to calculate average atomic mass of an element?

Why is NX3 Unstable? ... ?

Explain why scientists are concerned about human activities that cause global warming if global warming is caused by the greenhouse effect and the greenhouse effect is a natural part of Earth's climate

It takes 52.0 j to raise the temperature of an 11.7 g piece of unknown metal from 13.0∘c to 25.0 ∘c. what is the specific heat for the metal?

A bowling ball sits still on a table. which statement is most correct

Which reaction below represents the electron affinity of li? which reaction below represents the electron affinity of li? li (g) + e - → li - (g) li (g) + e - → li + (g) li + (g) → li (g) + e - li (g) → li + (g) + e - li + (g) + e - → li (g) ?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?