Moving from the element with atomic number 10 to atomic number 11 on the periodic table, there is a change in reactivity. In three to five sentences, identity the direction of the change, and give two reasons for the change. (4 points)
Moving from the element with atomic number 10 (neon) to atomic number 11 (sodium) on the periodic table, there is an increase in reactivity. This is because sodium has one more valence electron than neon, and valence electrons are involved in chemical reactions. The outermost electron shell of sodium is not as stable as that of neon, making it more prone to losing its valence electron and forming positive ions. Additionally, sodium has a larger atomic radius than neon, which means its valence electron is further from the nucleus and more easily influenced by external factors, leading to increased reactivity.
