Which combination of protons, neutrons, and electrons is correct for the isotope copper-63, ? 选项: A. 29 p+ , 29 n°, 63 e− B. 34 p+ , 29 n°, 34 e− C. 34 p+ , 34 n°, 29 e− D. 29 p+ , 34 n°, 29 e− E. 63 p+ , 29 n°, 63 e− 相关知识点...
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...
What is the difference between atomic number and mass number of an atom? Parts of an Atom: Atoms are the smallest unit of an element that still retains its properties. Atoms are made of subatomic particles, protons, neutrons and electrons. The protons and neutrons are arranged i...
An atom is made up of ___. A. protons, neutrons and electrons B. protons and neutrons only C. neutrons and electrons only D. protons and E. lectrons only 相关知识点: 试题来源: 解析 A。原子由质子、中子和电子组成。选项 B、C、D 都不完整。反馈...
Note: Atomic mass is a dimensionless quantity. Since the atomic number of sodium is 11, it has got 1 electron in the valence shell. Therefore, the valency of sodium is 1. The number of protons is equal to the number of electrons in sodium. But when s...
Normally, an atom of a given element has an equal number of protons and electrons. Protons are the heavy, positively charged particles found in the atom's inner nucleus, while electrons are light and negatively charged and orbit the nucleus. This means that there is no overall charge to the...
BeforetheCulturalRevolution,thenumberofstudentsinouruniversitywasonlyone-thirdwhatitisnow.Thiscomputerstoresthreetimesasmuchinformationasthatone.…threetimesmoreinformationthan…Itisnecessarytodeterminehowlong(atime)ittakestosolvethisdifficultproblem.4.下面举几个例子以便于说明如何使用这个表达式。5.这电路主要由五个...
Mass Number:The mass number is the sum of the number of protons and the number of neutrons in an atom. In-ground state, the total charge in an atom is zero. This is because the number of protons is equal to the number of electrons. If an atom acquires elec...
The mass number of an atom is the total number of protons and neutrons contained within the nucleus of the atom. The number of protons determines the element and will always equal the atomic number of that element. The number of neutrons can change and will determine which isotope of that...
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. ...