Write questions and answers in present perfect using these words 1-The documentary/Finish/Already.
2-My teacher/not/explain/ that lesson, yet.
3-Mark/give/ his mother/ a nice present

Using the spelling rules you learned, determine which of the following words is spelled correctly. (5 points) receipt whineing pumpping freind

What would be the mass of an atom with 8 protons and 8 neutrons? a) 16 amu b) 8 amu c) 64 amu

If an atom has no charge, what can we say about the subatomic particles in the atom? a) there will be the same number of protons and neutrons, but a different number of electrons. b) there will be the same number of electrons and neutrons, but a different number of protons. c) there will be the same number of protons and electrons.