A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is th

half-life of fermium-253?

3.0 days

4.5 days

17.5 days

20.0 days

How did j. j thomson's discovery affect the model of the atom? a. it proposed that atoms are mostly composed of empty space b. it proposed that electrons orbit the nucleus like the planets in the solar system. c.

Which of the following was NOT among Democritus's ideas

The molar mass of aniline is 93 g/mol. what is its molecular formula

Select all of the potential errors made when running a titration.

How do you calculate the number of moles of an element from a given mole quantity of a compound, using the chemical formula?

A intramuscular medication is given at 5.00mg/kg of body weight. What is the dose in grams for a 180-lb patient?

Nuclear fusion is the source of energy for stars. Besides hydrogen, which other element is most likely also common in stars?

Since the early 2000s, careers in the field of genetics have grown at a rapid pace. Which of these is a probable cause for this explosion of available and expanding jobs?

How many litres of 0.215 m NaCl contains 4.30 mol of this salt? Assume this solvent is H2O I'm confused on this question because little m is molality but when I looked this up on google, someone solved the problem assuming it was molarity

How can a neutral atom become a positively-charged particle?