Question

question 22 1 pts an atom can be described as chemically inert if its outermost electron shell contains __ electrons. eight nine two both a and c are correct. question 23 1 pts the element oxygen has an atomic number of 8, which means it contains: four protons and four neutrons. eight protons. eight neutrons. four protons and four electrons. question 24 1 pts the type of chemical reaction most likely to require energy is a(n) __ reaction. synthesis decomposition exchange all of the above reactions are equally likely to require energy.

Explanation:

• Question 22: Atoms are chemically inert when their outermost electron - shell is full. For most atoms, a full outer shell has 8 electrons (octet rule), and for the first shell (e.g., in helium), it has 2 electrons.
• Question 23: The atomic number of an element is equal to the number of protons in its nucleus. Oxygen has an atomic number of 8, so it has 8 protons.
• Question 24: Synthesis reactions involve combining smaller substances into larger ones and usually require energy input.

Answer:

• Question 22: D. Both A and C are correct.
• Question 23: B. eight protons.
• Question 24: A. synthesis