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Chapter 17 ppt.1


What is the smallest part of an element that still acts like that element? an atom
How many elements are there? 117 elements
How many are natural and how many are man-made? 90 are found in nature and 27 are man-made
What are the 5 elements that make up living things? (Conch) carbon, oxygen, nitrogen, calcium, and hydrogen
What element makes up 90% of the matter in the universe? hydrogen
What is a chemical symbol? It is a letter or letters that represent an element. The first letter is always captolized.
Describe the motion of atoms in solids, liquids and gases. Atoms move slowest in solids, faster in liquids and fastest in gases.
What is a chemical symbol? It is a letter or letters that represent an element. The first letter is always captolized.
It is a substance that is made of different elements combined in a fixed proportion. (water )
Why are atoms too small to be seen with visible light? Because light is made up of waves and atoms are smaller than a wavelength of visible light.
how can you see a molecule? It can be seen with an electron microscope.
What are compounds made of? Different kinds of elements.
What is in the nucleus of an atom? protons and neutrons are found in the nucleus
What is important about the nucleus? It is in the center region of the atom and it contains most of the mass of the atoms.
Created by: cdeutsch
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