1. The atomic mass of the most common isotope of magnesium is . 2. The element with an atomic number of 4 is .

3. exist in orbitals around the nucleus.

4. Oxygen has protons in the nucleus.

5. An isotope of an element has the same number of protons but a different number of .

I just did this for Penn Foster and the correct answers are:
1. 24
2. beryllium
3. Electrons
4. 8
5. neutrons
Hope this helps someone! :)

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil