Question

Arrange the reactivity of the following metals in decreasing order : Magnesium (Mg), Calcium (Ca), Sodium (Na), Potassium (K)​

Answer 1

Answer:

fist is k then ca then na and last is mg

Explanation:

Answer 2

Answer:

Magnesium (Mg),Sodium (Na),Potassium (K)​Calcium (Ca)

Explanation:

1) Magnesium continues to burn after oxygen is depleted. It than reacts with nitrogen from air to form magnesium nitride (Mg3N2). When attempts are made to extinguish magnesium fires with water, magnesium aggressively reacts with hydrogen gas.

2) It burns in air or pure oxygen to form the oxide and reacts rapidly with warm water (and more slowly with cold water) to produce hydrogen gas and calcium hydroxide. On heating, calcium reacts with hydrogen, halogens, boron, sulfur, carbon, and phosphorus.

3) Sodium doesn't react with nitrogen, not even at very high temperatures, but it can react with ammonia to form sodium amide. Sodium and hydrogen react above 200ºC (390ºF) to form sodium hydride. Sodium hardly reacts with carbon, but it does react with halogens

4) It reacts with hydrogen at approximately 350 °C (660 °F) to form the hydride. Potassium is highly reactive with halogens and detonates when it contacts liquid bromine. Violent explosions also have been observed when mixtures of potassium and halogen acids are subject to shock.