Helium has an atomic number of two. That means that there are two protons and electrons in the nucleus of a helium atom. Since its atomic mass is...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
If you are given the atomic weight of an atom, you need to subtract the number of neutrons to get the number of protons. Sometimes you can tell the elemental identity of a sample if all you have is the atomic weight. For example, if you have a sample with an atomic weight of 2, y...
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What is the number of protons in hydrogen?Subatomic particles:Protons are a type of subatomic particle that makes up the atoms of an element. Protons are found in the nucleus of the atom. Protons have a +1 charge. Other subatomic particles include neutrons and electrons....
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Name of element SymbolAtomic number(number of protons) 元素名称元素符号原子序数(质子的数目) jw2019 Astronomers term "metals" those elements with higheratomic numbersthan helium. 天文学家把原子量比氦更大的元素称为“金属”。 LASER-wikipedia2
The sum of an atom's protons and neutrons is its What nuclide has 27 protons and 33 neutrons? The atomic mass is equal to: A. the number of neutrons. B. the number of protons plus the number of electrons. C. the number of protons plus the number of neutrons. D. the number of el...
Every element has a unique atomic number. This is the number of protons in the nucleus of each atom. What is the atomic number of this helium atom? A neutral atom must have equal numbers of protons and electrons, so the atomic number of an element also gives the number of electrons. H...
More Lessons for Chemistry Math Worksheets Share this page to Google Classroom What is Atomic number? The number of protons in the nucleus of an atom is called theatomic number. It is represented by the symbolZ Example: Helium has an atomic number of 2 since it has two protons in its nuc...
What is the mass number for beryllium? Mass Number: A mass number is a total count of all the protons and neutrons in the nucleus of an atom. Protons are the positively charged particles in the nucleus while the neutrons have a neutral charge. Each particle has a mass count of one. ...