Answer:
4.
Explanation:
They are:
Each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first nonzero digit:
Answer:
when they have eight valence electrons.
Explanation:
When atoms do not have a full valence shell, the atoms are more likely to react with other and vice versa.
Answer:
Milk
Explanation:
Typically, the lower a substance is on the pH scale, the higher its acidity is and the higher the H+ concentration is. Conversely, the higher a substance is on the pH scale, the more basic it is and the lower the H+ concentration is. To be considered an acid, a substance has to be below 7 on the pH scale, since 7 is neutral. The highest substance on the pH scale that is still below 7 is milk, with a pH of about 6.5. Therefore, this is the answer. Hope this helps!
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom.
Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.
Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.