Atoms, Elements, and Compounds Overview

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What was the plum pudding model of the atom?

Atom is a ball of positive charge with negative electrons embedded in it.

Describe the findings of the alpha particle scattering experiment.

The experiment concluded that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was charged.

What is the smallest part of an element that can exist?

Atom

According to Neil Bohr, how do electrons behave in an atom?

Bohr suggested electrons orbit the nucleus at specific distances. Signup and view all the answers

How are compounds different from mixtures?

Compounds are chemically combined, while mixtures are not chemically combined. Signup and view all the answers

What did James Chadwick's work contribute to the atomic model?

Chadwick's work provided evidence for the existence of neutrons within the nucleus. Signup and view all the answers

What process can be used to separate mixtures that involve physical processes, not chemical reactions?

Filtration, crystallisation, simple distillation, fractional distillation, and chromatography. Signup and view all the answers

How can compounds be separated into elements?

By chemical reactions. Signup and view all the answers

What is the difference between compounds and mixtures?

Compounds are chemically combined in fixed proportions, while mixtures are not chemically combined and can be separated by physical processes. Signup and view all the answers

Explain the concept of chemical symbols in relation to atoms.

Chemical symbols represent atoms of elements, for example, Na represents an atom of sodium. Signup and view all the answers

How can compounds be separated into elements?

Compounds can be separated into elements by chemical reactions. Signup and view all the answers

In what way do mixtures differ from compounds in terms of separation methods?

Mixtures can be separated by physical processes like filtration, crystallisation, simple distillation, fractional distillation, and chromatography, while compounds can only be separated by chemical reactions. Signup and view all the answers

What does a compound contain and how is it represented?

A compound contains two or more elements chemically combined in fixed proportions and is represented by formulae using the symbols of the atoms from which they were formed. Signup and view all the answers

What was the key conclusion drawn from the alpha particle scattering experiment?

The mass of an atom was concentrated at the centre (nucleus) and that the nucleus was positively charged. Signup and view all the answers

How did Neil Bohr contribute to the model of the atom?

He suggested that electrons orbit the nucleus at specific distances. Signup and view all the answers

What did later experiments reveal about the positive charge in a nucleus?

The positive charge of any nucleus could be subdivided into a whole number of smaller particles, each having the same amount of positive charge (protons). Signup and view all the answers

How did James Chadwick's work contribute to the atomic model?

He provided evidence for the existence of neutrons within the nucleus. Signup and view all the answers

What is the significance of the atomic number of an element?

The atomic number is the number of protons in an atom of an element. All atoms of a particular element have the same number of protons. Signup and view all the answers