How many valence electrons are found in one atom of nitrogen (n) ? 2 5 7 14?

The continental crust is considered to be rich in iron and magnesium. What conclusion can you reach about the amounts of these elements that are necessary to enrich a substance? Explain.

Which of the following characteristics must be present for a substance to be called a mineral?

What is the total number of valence electrons in a sulfide ion in the ground state? (1) 8 (3) 16 (2) 2 (4) 18

Properties such as luster, conductivity, and flexibility are used to describe what type of elements

How are Igneous rocks formed?

For each of the following balanced oxidation-reduction reactions, (i) identify the oxidation numbers for all the elements in the reactants and products and (ii) state the total number of electrons transferred in each reaction. 1.

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?