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,...
Name of element Symbol Atomic 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 higher atomic numbers than helium. 天文学家把原子量比氦更大的元素称为“金属”。 LASER-wikipedia2 The atomic number of zinc is 30. 鋅的...
2018 The periodic table arranges elements based on their atomic number, or the number of protons each element has in its nucleus. Michael Irving, New Atlas, 25 July 2024 The elements heavier than iron (atomic number 26) form in nature through a process called rapid neutron capture, which ...
Often, the number of protons and electrons is not the same, so the atom carries a net positive or negative charge. You can determine the number of electrons in anionif you know its charge. A cation carries a positive charge and has more protons than electrons. An anion carries a negative...
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. What is Mass number Themass numberis the total number of neutrons and protons in the nucleus of the atom. ...
Protons and neutrons make up the nucleus and electrons orbit them in a cloud.Answer and Explanation: The mass number is not the number of protons. The mass number is the number of protons added to the number of neutrons. The mass number can be found......
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 atomic number of lithium is 3. This means that lithium has 3 protons. You can find the atomic number by locating the symbol for lithium (Li) on... See full answer below.Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our ...
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...
Atoms, the tiny particles that make up elements and combine to form functional molecules, are composed of three particles. Protons have a positive charge and are located in the nucleus of the atom, neutrons have no charge and are al...