In 1808, John Dalton wrote his atomic theory of matter. The following is a list of points from that theory. If it is still considered true today, label it true. If it is not considered true today, label it false.

1)Atoms cannot be subdivided.

2)Atoms cannot be created or destroyed in a chemical reaction.

3)All atoms of a given element are identicle in size mass and other properties.

4)All matter is composed of extremely small particles called atoms.

5)Atoms of different elements combine in hole number ratios to make compounds.

6)In chemical reactions, atoms are combined, separated or rearranged.

Do you have any thoughts? We would like to hear about them instead of simply giving you the answers.

Number 1 may not be worded very well. I CAN divide atoms in electrons, protons, neutrons, etc BUT I can't subdivide atoms without changing the kind of element.

true

1) False - Atoms can be further subdivided into subatomic particles, such as protons, neutrons, and electrons.

2) True - Atoms cannot be created or destroyed in a chemical reaction according to the law of conservation of mass.

3) False - Atoms of a given element can have different isotopes, which have slightly different masses.

4) True - All matter is composed of extremely small particles called atoms.

5) True - Atoms of different elements combine in whole number ratios to form compounds, as stated by the law of definite proportions.

6) True - In chemical reactions, atoms are combined, separated, or rearranged to form new substances.

To determine whether the points of John Dalton's atomic theory are still considered true today or false, we can evaluate each statement based on our current understanding of atomic theory:

1) Atoms cannot be subdivided: True. Atoms are considered the fundamental building blocks of matter and cannot be further divided into smaller particles while retaining their chemical properties.

2) Atoms cannot be created or destroyed in a chemical reaction: True. The law of conservation of mass states that matter is conserved in chemical reactions, meaning that atoms are neither created nor destroyed but are rearranged.

3) All atoms of a given element are identical in size, mass, and other properties: False. Although atoms of the same element typically have similar properties, we now know that there can be variations within the same element, known as isotopes. Isotopes have different numbers of neutrons, which can result in variations in mass but not in other properties.

4) All matter is composed of extremely small particles called atoms: True. This statement aligns with our current understanding. All matter is composed of atoms, which are the smallest units of an element that retains its chemical properties.

5) Atoms of different elements combine in whole number ratios to make compounds: True. Dalton's statement is still considered true today. Elements combine in fixed ratios to form compounds, and these ratios can often be expressed as whole numbers. This principle is the foundation of stoichiometry in chemistry.

6) In chemical reactions, atoms are combined, separated, or rearranged: True. This statement remains true today. In chemical reactions, atoms can combine to form new compounds, separate from existing compounds, or rearrange to form different compounds while maintaining the same atoms.

So, the labels for each statement are as follows:

1) True
2) True
3) False
4) True
5) True
6) True