Who was the Greek Philosopher that first stated that atoms exist and gave the name “ATOM?”

The chemical symbol of argon is Ar. An isotope of this element has an atomic number of 18 and a mass number of 38. What are the isotopic notation, the number of protons, and the number of neutrons of this isotope of argon?

Which of the three major subatomic particles has/have a mass of approximately 1 amu?

Which of the following is not what John Dalton stated in his atomic theory?

The density of copper is 8.92 g/mL. What is the mass of a piece of copper that has a volume of 10.7 mL?

Which of the three major subatomic particles has/have a mass of approximately 1 amu?

Calculate the volume of a cube (in cm3) with the dimensions: length = 2.3 cm, width = 0.44 dm, height = 0.29 dm V = l x w x h

Round 23456 to four significant figures.

What is the correct answer to the following expression: (53 + 63) x 0.17051? Carry out the addition operation first.

Which of the following is not what John Dalton stated in his atomic theory?