What are element???

What is an element?

• A substance that can be broken down into simpler substances by physical means.

• A pure substance that can be broken down into two or more simpler substances by chemical processes.

• A pure substance that cannot be broken down into two or more simpler substances by chemical processes.

• A mixture of two or more substances.

How are chemical symbols for elements typically represented?

• Always with a single lowercase letter.

• Using three or more letters.

• With one or two letters, where the first letter is always capitalized.

• With one or two letters, where both letters are always capitalized.

Which of the following is a characteristic property of most metals?

• They are typically found in a gaseous state at room temperature.

• They have a dull, non-lustrous appearance.

• They are poor conductors of heat and electricity.

• They are malleable and ductile.

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What is the fundamental unit of an element, and how do molecules differ from elements in terms of atomic composition?

• The fundamental unit of an element is a molecule; molecules are formed by a single type of atom.

• The fundamental unit of an element is an atom; molecules are formed by two or more atoms that are chemically combined.

• The fundamental unit of an element is a compound; molecules are formed by physically mixing atoms.

• The fundamental unit of an element is a proton; molecules are formed by combining different types of elements.

What distinguishes a compound from other molecules?

• Compounds are formed by atoms of the same element.

• Compounds are formed by atoms of different elements.

• Compounds are always gases at room temperature.

• Compounds can only be broken down by physical means.

What type of compound is formed when a metal element combines with a non-metal element?

• Covalent compound

• Molecular compound

• Ionic compound

• Elemental compound

How do the properties of a compound relate to the properties of the elements that form it?

• The compound retains all the properties of its constituent elements.

• The compound has completely different properties from its constituent elements.

• The compound's properties are a simple average of its constituent elements' properties.

• The compound's properties are only slightly different from its constituent elements.

In the chemical formula H₂O, what does the subscript '2' indicate?

• There are two oxygen atoms.

• There are two hydrogen atoms.

• The compound has a molecular weight of 2.

• The compound is a diatomic molecule.