Answer: 18
Justification:
1) The most common ion of calcium is Ca 2+
2) That means that the atom, neutral calcium, has lost two electrons.
3) The atomic number of calcium is 20.
4) Atomic number is the number of protons, so calcium has 20 protons.
5) Therefore, the neutral atom of calcium also has 20 electrons (to make a net charge of zero).
6) Then, the ion Ca 2+ has 20 - 2 = 18 electrons.
Answer: 18 electrons.
The answer to this question is B
Answer:
She will have symptoms of dizziness and/or lightheadedness
Explanation:
Answer: A hydrogen bonding is interaction between lone pair and hydrogen atom. An Ion-Dipole interaction is the interaction between an ion formed and a dipole. Dipole forms because of the electronegativity difference between two atom participating in the bond formation, and an ion is formed when an atom gains or lose electron. This ion-dipole interaction is strongest interaction.
Therefore, The right choice is (B)