Element X has two isotopes. Isotope 1 has mass {m1} u and abundance {p}%; isotope 2 has mass {m2} u and abundance (100−{p})%. Calculate the average atomic mass in u.

A nuclide has a neutron-to-proton ratio that is too small. Which process can increase that ratio without changing the mass number?

What is the correct name for N₂O₄?

An element has isotopes of masses {m1} u, {m2} u, and {m3} u with abundances {p1}%, {p2}%, and (100−{p1}−{p2})%, respectively. Calculate the average atomic mass.

Which particle completes this transmutation reaction?14N + 4He → 17O + ?

A radioisotope has a half-life of {th} years. A sample has been decaying for exactly {n} half-lives. Calculate the age of the sample in years.

Two neutral atoms have the same number of protons but different numbers of neutrons. They are

Which statements are characteristic of Group 7A (17), the halogens? Select all that apply.

Question 8For the following code, what are the values of idx and selected?x = [1 0 1 1]; y = [0 7 5 0]; mask = x & y; idx = find(mask); selected = y(mask);

The atomic number of an element is determined by the number of protons in its nucleus.