Which of the following elements has the least number of protons? A. Hydrogen B. Helium C. Lithium D. Beryllium 相关知识点: 试题来源: 解析 A。解析:氢(Hydrogen)的原子序数为1,也就是质子数为1;氦(Helium)原子序数为2,质子数为2;锂(Lithium)原子序数为3,质子数为3;铍(Beryllium)原子序数为4,...
It's easy to get a hydrogen atom with one proton and one neutron (deuterium), yet you won't find a helium atom with an atomic weight of 2 because this would mean the helium atom had two protons and zero neutrons! If the atomic weight is 4.001, you can be confident the atom is hel...
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 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 nucleus. Lithium has an atomic number of 3 since it has three protons in its nucleus. ...
neutrons are found in the nucleus of the atom, while the electrons are outside the nucleus. The atomic number is the number of protons, while the mass number is the number of protons and neutrons. If an element is not charged, the number of electrons will equal the number of protons. ...
What is the mass number of titanium? Atomic Number: Each element on the periodic table has two important numbers, the atomic number and the mass number. The atomic number is equal to the number of protons and the mass number is equal to the mass of one atom in atomic mass units (amu)...
The meaning of ATOMIC NUMBER is an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines t
The number of protons in an atom equals the number of ___. 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...
The number of protons in an element is equal to its atomic number (Z).- For Uranium 23892U: - Number of protons = 92 - For Thorium 23490Th: - Number of protons = 90 Step 3: Calculate the number of neutronsThe number of neutrons can be calculated using the formula:Number of ...
The atomic number of an element is defined as the number of protons in the nucleus of one atom of that element. This element is represented by the chemical symbol Xe. Xenon is found naturally occurring in the atmosphere, but only in very small amounts (i.e., less than 0.00001% of the...