أرشيف الوسم : Number

ATOMS Law of constant composition: This states that “A chemical compound (if pure) always contains the same elements combined together in the same proportion by mass regardless of bow the compound is prepared or from where it is obtained”. Law of conservation of mass: This is defined as “In every …

Isotopes: Isotopes are atoms of the same element having the same atomic number but different atomic masses. Note that the difference in the masses of isotopes is due to the different number of neutrons in their nuclei. Isotopes have the same chemical properties . because they have the same number of …

Atomic Number: Atomic number of an element is equal to the number of protons present in the nucleus of an element. Atomic number = number of protons in one atom of element. Since the atom as a whole is neutral therefore atomic number is the same as the number of …

العدد الذري atomic Number : و يعرف أيضا باسم العدد البروتوني و يرمز له بالرمز Z . و هو عدد البروتونات في النواة . عدد البروتونات يساوي دائما عدد الإلكترونات التي تدور حول النواة .