What does the atomic number represent on the periodic table

Write the empirical (or molecular) formulas of compounds that these elements in the third period are expected to form with molecular oxygen and molecular chlorine.

A) how many hydrogen atoms are in an acyclic alkane with 5 carbon atoms?

Mutations in the nucleic acid sequence of a gene can sometimes direct the substitution of one amino acid for another in the encoded protein.

An example of a heterogeneous mixture is 1. soil 2. sugar 3. carbon monoxide 4. carbon dioxide

If all of the forces acting on a car are balanced, then: A. the direction the car is moving will not change. B. the car will speed up. c. the velocity of the car will increase. D. the acceleration of the car will be negative.

Which of these groups of metal would have the most similar properties?. a. Ag, Au, Cu, Zn. b. Cr, Fe, Co, Ni. c. Al, Si, P, S. d. Mg, Ca, Sr, Ba

Organs combine to form ... A cells B tissues C organ systems D organisms

What are real world examples of chemical changes?

Addition of a catalyst can speed up a reaction by providing an alternate reaction pathway that has a

Select the answers below that represent the ionic compounds in this list: na2so4 h2so4 ch3-ch3 n2o4 cacl2 ca3 (po4) 2