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

phosphorus (P) and chlorine (Cl)

beryllium (Be) and calcium (Ca)

chlorine (Cl) and helium (He)

oxygen (O) and carbon (C)

The concentration of a hydrogen ion is 1.0 x 10 to the - 7 power then what is the POh

A water sample tested positive for lead with a concentration of 35 ppm. The density of the solution is 1.00 g/mL Which of the following statements is correct? A. 100 g of the solution contains 35 g of lead B. there are 35 mg of lead in 1.

What substances are in H2CO3 (aq) H2O (I) + CO2 (g)

Fórmula de 10 ácidos

What type of substance would result from the bonding of elements carbon and chlorine? Select one: a. None of the answer choices b. Ionic c. Metallic d. Covalent

Which Of These Is An Indication That A Chemical Reaction Has Occurred? A. Freezing Of A Substance B. Melting Of A Substance C. Boiling Of A Substance D. Formation Of A Gas

When a soda can is dropped, it should not be immediately opened. Why? (A) The soda will squirt out because of decreased temperature. (B) The soda will squirt out because of increased temperature.

Explain the difference between layers and band.

A metal block has a mass of 122 grams and measures 2cm x 2cm x 4cm. What is the density of the block?

What are valency and radicals