Which of these pairs of elements have the same number of valence electrons?

phosphorus (P) and chlorine (Cl)

berylium (Be) and calcium (Ca)

chlorine (Cl) and helium (He)

oxygen (O) and carbon (C)

How many chromosome does each sperm cell contain

What is the formula for heat of fusion?

Which of the following statements regarding Anfinsen's denaturing experiments with ribonuclease A (RNAse A) are valid?

Which of the following pairs of elements belong to the same group? A. (H) & (He) B. (Li) & (Be) C. (C) & (Pb) D. (Ga) & (Ge)

Name the type of reaction: 8 Fe + S8 → 8 FeS

What compares a law and a theory?

Explain what domain would best be represented by the "?" in the diagram. A) Eukarya because the organisms are all eukaryotic. B) Eukarya because the organisms are all prokaryotic. C) Bacteria because some of the organisms are autotrophs.

If you are eating a hamburger, it is an example of a consumer eating another consumer. a) true b) false

What mass of NaNO3 is needed to make 3.5 L of 2.2 M solution? (Na = 23.0g, N=14.0g, O=16.0g) Explain in steps

In which group do all atoms have seven valence electrons in the ground state?