Which of the following statements are true? 1. The number of protons in an element is always the same for all
neutral atoms of that element.
II. The number of electrons in an element is always the same for all
neutral atoms and ions of that element. .
III. The number of neutrons in any element is always equal to the
number of protons of that element.
IV. The number of neutrons in an element can sometimes vary -
resulting in the formation of an unstable isotope that is
slightly
more (or less) massive than the stable atom of the same element.

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet