Table of Contents
Who said that compounds are formed when atoms of different elements combine?
Dalton
(4) ‘Compound elements’ (i.e. compounds) are formed when atoms of different elements join in simple ratios to form ‘compound atoms’ (i.e. molecules). Dalton also proposed symbols for atoms of different elements (later replaced by the present notation using letters).
What was John Dalton’s model of the atom called?
the billiard ball model
Based on all his observations, Dalton proposed his model of an atom. It is often referred to as the billiard ball model. He defined an atom to be a ball-like structure, as the concepts of atomic nucleus and electrons were unknown at the time.
What did Dalton discover about the atoms that combine to form compounds?
While all atoms of an element were identical, different elements had atoms of differing size and mass. Dalton’s atomic theory also stated that all compounds were composed of combinations of these atoms in defined ratios. Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms.
What happens when two atoms of identical elements combine?
E.g HCl,HCN,NaOH etc.. So if two atoms of identical elements combine it will be called both the molecule and compound.Simple is that compound is specific, there only different atoms combine .And molecule is general . Every compound is a molecule but every molecule is not a compound.
How many atoms are needed to make a compound?
A compound must consist of at least two different elements, while molecules are merely two or more chemically bonded elements, same or different. Two hydrogen atoms form to make one hydrogen molecule. A water (H2O) molecule is a compound because it consists of more than one different element; in its case: hydrogen and oxygen.
What makes a molecule different from a compound?
A molecule. All compounds are molecules, but not all molecules are compounds. A compound must consist of at least two different elements, while molecules are merely two or more chemically bonded elements, same or different.
How are molecules formed and how are they formed?
Depending on the element, they sometimes form a molecule, and never form a compound. Molecules refer to a type of structure. Each molecule is formed through covalent bonds and the molecules stay together through various intermolecular forces like London forces and hydrogen bonds.