Which element is a gas at STP?

1) sulfur

2) xenon

3) potassium

4) phosphorus

Which of the following shows the correct quantum numbers (n; ℓ; mℓ) and electron configuration for the highest energy electron (s) in the given atoms? 1. Rb: [Kr]5s 1; n = 5; ℓ = 0; mℓ = 0, 1 2.

A neutral atom has a mass number of 108 and in atomic number of 47 which atom is this? explain how you know. ^how many Protons electrons and neutrons are in this Atom.

Which atom absorbs more energy, one in which an electron moves from the second shell to the third shell or an otherwise identical atom in which an electron moves from the first to the third shell?

8. How many electrons are in the outermost shell of a sulphur (S) atom? A. 1 B. 2 C. 6 D. 7

All oxygen atoms have eight protons, and most have eight neutrons as well. What is the mass number of an oxygen isotope that has nine neutrons? What is the name of this isotope?

23491pa undergoes beta decay. what is the mass number of the resulting element?

What is the Mass in grams of 3.1 mol of mercury

A helium balloon contains 0.48 g of helium. Given the molecular weight of helium is 4.0g/mol, how many moles of helium does it contain?

Three differences between a science and a pseudoscience

Why is it illegal to manufacture fireworks without a license