How many protons, neutrons, and electrons are there in an atom of potassium-39?

What are the three basic types of solids and the composite units of each? What types of forces hold each type of solid together?

Charcoal and copper are black how do you distinguish

Rank the species (amide ion, ammonia, or ammonium ion) from the largest to the smallest H-N-HH-N-H bond angle? Rank from largest to smallest H-N-HH-N-H bond angle. To rank items as equivalent, overlap them.

What is the final temperature of 78g sample of water at 99°C if it loses 6500 J of heat energy?

How many valence electrons does fluorine have?

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin

How many vowels does the word love have

What is silicon used for? -matches -gunpowder -glass -steel can coating