The density of gold is approximately. 1785 g/L. What is the mass of a sample of helium that occupies 50.0 L of space? Round your answer to the correct number of significant figures. 1.00 g 9.00 g 50.0 g 280. g

What solid is not made of crystals?

Why is the radius of a positive ion always less than the radius of its neutral atom? (A) the nucleus pulls the remaining electrons in closer. (B) The number of principal energy levels is always reduced.

Draw a structural formula of the sr configuration of the compound shown below.

How many protons are in an ion with 36 electrons and a - 1 charge?

Sodium plus chlorine gas yields sodium chloride

Electron configuration for iron?

Explain how melting is considered endothermic

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

Give the full atomic symbol for an atom that has 30 neutrons and an atomic number of 25

Maxwell, a russian scientist, created an early peridoc table of the elements. true or false