How many valence electrons are represented in the following electron configuration? 1s22s22p5

Which describes the role of carbon dioxide in photosynthesis? It is a reactant, so it is released by the plant. It is a product, so it is released by the plant. It is a reactant, so it enters the plant. It is a product, so it enters the plant.

Lithium and potassium have similar chemical properties because the atoms of both elements have the same (1) mass number (2) atomic number (3) number of electron shells (4) number of valence electrons

Balance this redox reaction occurring in acidic media: Cr2O7[2-] (aq) + Cl[-] (aq) Cr[3+] (aq) + Cl2 (g)

Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell? Scandium Cesium Iodine Xenon

A sodium atom loses one electron. Which of the following is the correct symbol for the sodium cation? Na - Na + Na+2 Na+3

A liquid with a high viscosity cannot be a mixture.

A scientist working in a lab wants to determine the approximate ph of a filtered biological solution using a visual test. which tool should the scientist use to measure ph?

When salt is introduced to water, the temperature at which freezing occurs is?

2. How many particles are present in one mole of particles?

Find the number of grams of HCl needed to react completely with. 50 moles of magnesium. Mg (s) + 2HCl (aq) - -> MgCl2 (aq) + H2 (g)