An element's atomic number is the

a. number of protons in an atom's nucleus.

b. weight of the atom.

c. mass of the atom.

d. sum of the protons and neutrons in an atom.

What is true about the energy involved in a chemical reaction? A. The amount of energy is constant, but it is converted from one form to another. B. The amount of energy decreases as it is converted from one form to another. C.

In the simulation, open the micro mode, then select solutions indicated below from the dropdown above the beaker in the simulation. the beaker will fill up to the 0.50 l mark with the solution at 25 ∘c.

What element on the periodic table has a mass number of 155 and 99 for the number of electrons

How many grams of potassium iodide will produce 500 grams of silver iodide, when there is an excess of silver nitrate? Why? A. 235 B. 707g C. 166g D. 301g

What would happen of scientific knowledge was not debated and confirmed by scientist?

Is the water density higher than the aluminum density

How many moles of molecular oxygen (o2) are consumed in the complete combustion of one mole of pentane (c5h12) ?

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.