Elements

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A pictorial periodic table of elements

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All the atoms that make up a single element have the same number of protons.
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All atoms except those of the simplest form of hydrogen also contain neutrons.
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Electrons circle the nucleus at different distances depending on how much energy they have.
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Table of Contents

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gamma rays radioactivity – atoms decays (break down) to send out gamma rays and particles.

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Electromagnetic wavelengths

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electromagnetic radiation is electric and magnetic fields that move in tiny bursts of waves or photons.
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there are different kinds of electromagnetic radiation, each with different wavelengths.
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together, these forms of electromagnetic radiation are called the electromagnetic spectrum.
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all electromagnetic rays move the speed of light – 299,792,458 metres per seconds.
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everything that can be detached in space is picked up by the radiation that it gives out.
radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation.
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radio waves have the longest wavelength.
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gamma rays have the shortest wavelength.
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very short wave
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energetic and dangerous form
of electromagnetic radiation.
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gamma rays telescope discovers extremely luminous gamma-ray sources (see YouTube).
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radio waves are a long wave
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low-energy radiation
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communication: radio waves are used for broadcasting television and radio, mobile phones, and satellite communications.
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other applications: radio waves are also used in microwave ovens, radar, and industrial and medical applications.
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safety: radio waves don’t damage the human body if absorbed
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