Answer:
oxygen has 6 valence, nitrogen has 5, calcium has 2 valence electrons
argon has 3 energy levels
potassium and calcium share an energy level
Explanation:
Answer:
Explanation:
Question 1.
- Potassium and calcium both appear next to each other in the fourth row of the periodic chart, making them period four elements.
- They both react with water to form hydroxides and release hydrogen gas. Potassium metal reacts very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H2)
The reaction between calcium and water forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2).
Question 2.
Valence electrons refer to the number of electrons in the outermost shell. A quick way to get this is to look up the group Number.
Oxygen has 6 Valence electrons. (Group 6)
Nitrogen Has 5 valence electrons. (Group 5)
Calcium has 2 valence electrons. (Group 2)
Question 3.
Argon has 18 protons and 18 electrons. There are 2 electrons on the first energy level, 8 electrons on the second level, and 8 electrons on the third energy level. So Three energy levels
