An element's atomic numberis equal to the number of protons in the nuclei of any of its atoms. The mass number of an atom is the sum of the protons and neutrons in the atom. Isotopes are atoms of the same element (same number of protons) that have different numbers of neutrons in t...
选(D)。 If hyperfine structure is ignored, an atomic state 2 P3/2 in a weak external magnetic field will be split into a number of states equal to (A) 2 (B) 3 (C) 4 (D) 5 (E) 6 解:当外加磁场较弱时,为反常 Zeeman 效应,原子将分裂为 2J+1 个态;当外加磁场较强...
The total number of protons and neutrons added together is called the relative atomic mass. Hydrogen has a relative atomic mass of 1, while helium's relative atomic mass is 4 (because there are two protons and two neutrons inside). In other words, an atom of helium is four times heavier...
The atomic number (原子序数)is equal to the number of electrons per atom or, what is equivalent, the number of protons (质子)per nucleus. 原子序数等于每个原子中的电子数,也就是说,每个原子核的质子数。 what is more “而且;更有甚者” what is more important “更为重要的是” what is the...
the same number of protons, which carry a positive charge, and electrons, which carry a negative charge of equal magnitude. The number of neutrons, which along with protons make up the nuclei (singular nucleus) of atoms and have no electrical charge, approximates the number of protons to ...
Parts of the Atom. Example Example 1: The atom of an element has a mass number of 214 and an atomic number of 82. a) How many protons and neutrons does it have? The number. Has mass and takes up space Topic: Structure of an Atom neutral equal electrons Atomic Number = Proton...
The atomic mass of an atom is approximately equal to the number of protons plus the number of electrons, since the mass of electrons is practically negligible. References Purdue University: Bodner Research Web: The Atom and Electromagnetic Radiation ...
Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.How To Calculate The Average Atomic Mass30 related questions found What do you call the element from atomic number 57 71? Lanthan...
Protons are the positively charged particles that are present inside the atom. Also, it exists in the nucleus of the cell. Furthermore, the proton is larger in shape than an electron. The charge of a proton is equal to the charge of an electron to maintain the balance in the atom. ...
Atoms are electrically neutral if they have an equal number of protons and electrons. Atoms that have either a deficit or a surplus of electrons are called ions. Electrons that are farthest from the nucleus may be transferred to other nearby atoms or shared between atoms. By this mechanism, ...