An isotope of xenon has an atomic number of 54 and contains 77 neutrons. What is the xenon isotope's mass number? 23 54 77 131

Can you Convert 75°F to °C

Which is a correct comparison between the modern quantum model and John Dalton's model of the atom? The modern model is not as widely accepted by scientists as Dalton's model.

Which Group 15 element exists as diatomic molecules at STP? (1) phosphorus (3) bismuth (2) nitrogen (4) arsenic

When and how was discovered mercury?

Match the term with its description. Match Term Definition Acid (A) An atom or molecule that has a positive or negative charge Base (B) A value from 0 to 14 that is used to specify how acidic or basic a compound is when it is dissolved in water Ions

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.

Suppose you were given a substance and asked to determine whether or not it was a plasma. Write the characteristics you would look for to identify the substance.

What is a comet? tell in a short and easy answer