Roberd Boyle was the first scientist to use the term element in 1661. Antony Laurent Lavoisier , a french chemist , was the first to establish an experimentally useful definition of an element.He defined an element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions.Elements can be normally divided into metals,non-metals and metalloids.
10. Name two elements are present in liquid state at room temperature.
11. The process in which the metals are beaten into thin sheets is called _________-.
12. Which of the following materials fall in the category of an element?
Iron b) salt solution c) Gold d) Sodium chloride.
13. A substance that cannot be broken into simpler substances by chemical means is called as ______________________.
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10.ans Only two elements on the periodic table are elements at room temperature. They are mercury (a metal) and bromine (a halogen). Four other elements are liquids slightly warmer than room temperature. They are francium, cesium, gallium, and rubidium (all metals).
11.ans The property of metals by which they can be beaten into thin sheets is called malleability.
12.ans iron and gold fall in the category of an element.
13.ans elements
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