Question

Which of the following was not a part of Dalton's atomic theory? Group of answer choices Each element is composed of atoms, which are identical for that element. The reactivity of elements involves changes in their electron configuration. Chemical combination is the bonding of a definite number of atoms of each of the combining elements. No atoms are gained, lost, or changed in identity during a chemical reaction.

Answer 1

Explanation:

Dalton's Atomic Theory

All matter is made of atoms. Atoms are indivisible and indestructible.

All atoms of a given element are identical in mass and properties.

Compounds are formed by a combination of two or more different kinds of atoms.

A chemical reaction is a rearrangement of atoms.

Dalton's Atomic Theory

Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.

Answer 2

Of the following 'The reactivity of elements involves changes in their electron configuration' was not a part of Dalton's atomic theory.

• The statement 'Each element is composed of atoms, which are identical for that element' was a part of Dalton's atomic theory. The atoms in a pure material or element are all the same, yet they differ from the atoms of another element.
• The statement 'Chemical combination is the bonding of a definite number of atoms of each of the combining elements' was also part of Dalton's atomic theory as they are formed in a fixed ratio.
• The statement 'No atoms are gained, lost, or changed in identity during a chemical reaction' was a part of this theory because they are neither created nor destroyed.
• Hence, the second statement 'The reactivity of elements involves changes in their electron configuration' was not a part of Dalton's atomic theory.