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Abril Hensley
19 January, 14:54
What do hydrogen and helium have in common?
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Zain Kline
19 January, 15:19
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Atomic disguise makes helium look like hydrogen ... A helium atom consists of a nucleus containing two positively charged protons and two neutrons, encircled by two orbiting electrons which carry a negative charge. A hydrogen atom has just one proton and one electron
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