ii. Give Reason: Magnesium has valency +2.
iii. State the law of constant Proportion.
iv. Define Atomic mass number.
Define 1 mole.
Answers
Answer:
2)Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell.
3)In chemistry, the law of definite proportion, sometimes called Proust's law, or law of constant composition states that a given chemical compound always contain its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation
4)The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles..