Which of the following is always true about radioisotopes?

A) They have unstable nuclei.

B) Their neutron-to-proton ratio is 1:1.

C) Their decay products are stable isotopes.

D) all of the above

The answer is A, I just passed my test.

How many moles of carbon dioxide will form if 2.5 moles of C3H8 is burned

Which has a larger atomic radius Be or Ba

How did the grand canyon form

Maria needs to dilute her stock of 15.0 M HNO3 solution for a lab. She wants to get 525 mL of 1.00 M HNO3. How many mL of 15.0 HNO3 must she prepare?

How many electrons can each p-orbital hold, and since there are 3 different p-orbitals, how many electrons can all three hold?

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B.

Zircon is a mineral with the empirical formula ZrSiO4. If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10. g of zircon?

Which property below is not a general property of metals: A. Ductile C. Malleable B. Poor conductor of heat D. High luster

Calculate the number of particles (atoms or molecules) of the following: 1. How many molecules are there in 24 grams of FeF3? 2. How many molecules are there in 450 grams of Na2SO4? 3. How many grams are there in 2.3 x 1024 atoms of silver?

Write a balanced equation for the decomposition reaction described, using the smallest possible integer coefficients. When calcium carbonate decomposes, calcium oxide and carbon dioxide are formed.