What are valence electrons and why are they important?

How did Dalton describe the relationship between atoms and elements? Atoms are made up of combinations of elements. An element is made up of one kind of atom. Elements are made up of atoms arranged in whole-number ratios.

What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?

Which type of heat exchanger shell and tube or plate heat exchanger is suitable for evaporation?

Write the identity of the missing nucleus for the following nuclear decay reaction: 224 88Ra→42He+?

What happened when the earth rotates? What happens when the earth revolves? How does the sun's apparent movement affect what shadows do?

Identify each element as a metal, metalloid, or nonmetal. a. gold b. silicon c. manganese d. sulfur e. barium

Extreme (1, 2, or 3) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (4, 5, or 6) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei. 1. expansion 2. heat 3.

What type of change is a substance that changes form but remains the same?

How to generate crystal structure using wyckoff positions?

What is a Agricultural waste used as fuel is an example of a?