Identify the period or group number described for the following case:

a) contains elements C, N and O

b) start with helium

c) Contains the alkali metals

d) end with neon

What is the difference between molar mass and atomic mass

What type of force is magnetic force? Contact force Normal force Force of friction Non-contact force

Why is it important to keep the water on Earth pollution free? Explain.

The molecular property related to the ease with which the electron density in a neutral atom or molecule can be distorted is called

In what region of the periodic table will you find elements with relatively high IEs? With relatively low IEs?

How many grams of sodium ions are in na2so4?

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