What element has 3 electrons in its 5d sublevel?

A. Nd

B. Nb

C. Ta

D. U

A hypothetical pure element consists entirely of two isotopes. the natural percent abundance of the isotope with mass 25.2 u is 80.1%. the other isotope has mass 29.4 u. calculate the atomic weight of the naturally occurring element

The number of charges on an Anion is determined by its Group Position relative to

Which of the following instruments is used to measure air pressure? A. Anemometer B. Thermometer C. Barometer D. Hygrometer

Which element is a halogen? argon bromine calcium lithium

A beaker containing a mixture of N2 (g) and H2 (g) is cooled by placing it in a tray of cold water. In response to the cooling, the likely number of collisions between the molecules of N2 (g) and H2 (g) will. The rate of the reaction will.

How many molecules of sodium nitrate are produced when 17 g of sodium azide, NaN3, react according to the following equation: NaN3 (aq) + AgNO3 (aq) - --> AgN3 (s) + NaNO3 (aq) Question options: 3.7x1023 1.6 x 1023 1.85x1023 6.02x1023

Which statement is true for the given reaction? Zn + PbSO4

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?