Describe and give an example of parasitism.

A proton is a subatomic particle carrying a charge equal to but opposite that of an electron. True or False

Which of the following elements has seven valence electrons? N Cl Fr Ar

Silicon has four electrons in its outer energy level. What type of bond is silicon mostly likely to form with other elements? Explain.

Ammonia is often formed by reacting nitrogen and hydrogen gases. how many liters of ammonia gas can be formed from 22.7 l of hydrogen gas at 93.0°c and a pressure of 49.6 kpa?

Which elements can react to produce a molecular compound?

How many moles of n are in 0.187 g of n2o?

A molecule has four unshared electrons on the central atom and four chlorine atoms bonded to the central atom. What is its molecular shape and its hybridization?

What experiment did J. J thomson do? A) He suspended charged oil drops in a chamber B) He shot alpha particles through golf foil C) He sent a cathode ray between electrically charged metal plates D) He hit metal plates with light

Compared to a potassium atom, a potassium ion has A) a smaller radius B) a larger radius C) fewer protons D) more protons

Which unit measures mass?