Answer:
The number of neutrons is entirely dependent on the Mass number of the particular atom. The standard mass for potassium is 39.
Potassium is element number 19, so it has 19 protons and 19 electrons in the neutral atom. It has therefore 39-19 = 20 Neutrons.
Explanation:
8.509 kilocalories I think
Answer: A Lewis structure is a structural representation of a molecule where dots are used to show electron positions around the atoms and lines or dot pairs represent covalent bonds between atoms.
Explanation: Lewis structures are also called Lewis dot diagrams, electron dot diagrams, Lewis dot formulas, or electron dot formulas. Technically, Lewis structures and electron dot structures are different because electron dot structures show all electrons as dots, while Lewis structures indicate shared pairs in a chemical bond by drawing a line.
Answer:the third one/ regulates the transfer of material into and out of the cell.
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Balanced equation:
<span>2 Na + 2 H₂O = 2 NaOH + H₂</span>
mole ratio :
2 moles Na ----------- 2 moles H₂O
12 moles Na --------- ? moles H₂O
moles H₂O = 12 x 2 / 2
moles H₂O = 24 / 2
= 12 moles of H₂O
hope this helps!