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this is how sodium appears in the periodic table.

the arrow is pointing to sodium’s

number of neutrons.
number of valence electrons.
combined number of neutrons and protons.
combined number of electrons and protons.

12 Neutrons

1 Valence Electron

23 ions [11 Protons and 12 Neutrons]

22 ions [11 Electrons and Protons]

Explanation:

To find the number of neutrons in an element, you simply take its atomic number and deduct that from the atomic mass [round if necessary]. There is one valence electron because according to the Periodic Table of Elements, the first three energy levels can fit 2 - 8 electrons:

1st Energy Level → 2 Electrons

2nd Energy Level → 8 Electrons

3rd Energy Level → 8 Electrons

4th Energy Level → 18 Electrons

5th Energy Level → 18 Electrons

6th Energy Level [Lanthanide Series] → 32 Electrons

7th Energy Level [Actinide Series] → 32 Electrons

So, as you can see, 2 + 8 gives you 10. So from there, we already filled up 2 energy levels. Now going to the third one will leave us with only one electron left over. That is where that valence electron is.

** I encourage you to write this down in your Chemistry notebook somewhere, so you can keep this stored in your memory at all times. There are some pointers in the answer as well. Copy that.

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.