Neutrons are neutrally charged subatomic particles found in the nucleus of an atom along with the positively charged protons. Together, protons and neutrons contribute equally to the mass number of the atom. An
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Mass of isotopes Isotopes containing more neutrons have a greater mass. 具有相同质子数不同中子数的原子互为同位素。中子数多的同位素质量更大。 In spite of these differences, isotopes of an atom have the ...
2\. Above the symbol is the atomic number (Z) which is equal to the number of protons in the nucleus and the number of electrons in the electron cloud (given that the atom is neutral). For carbon Z=6. 3\. Below the symbol is the atomic mass. While this number is a weighted aver...
百度试题 结果1 题目3 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? B A 21 B 24 C. 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
百度试题 结果1 题目5 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
Note that the mass number of lithium is 6.94, representing the sum of the numbers of protons and neutrons in the nucleus of one atom. Step 3 Note that the mass number is equal to the mass (in grams) of one mole of lithium; this is the molar mass of lithium.Determine the Molecular ...
Step 4:Match the isotopes to the masses identified in the spectrum. Vocabulary for Using the General Properties of Equilibrium Constants Isotopes:Isotopes represent the same element. They are atoms that have the same number of protons but differ by the number of neutrons, and ...
How to determine valence electrons? What would happen if OH-ions were added to a very basic solution? What charge would an ion that has 11 protons, 11 neutrons, and 10 electrons would have? There are the same amount of protons and electrons in an atom. If this is true, than how are...
The mass of the electron has also been determined using a mass spectrometer — in that case, electrons were simply sent through the instrument themselves. That measurement enables physicists to determine the mass of an atom when it has the correct number of electrons, rather than a dearth or ...
in each atom. For example, the number of protons an atom has will determine the atom's place on the periodic table, and it will determine how the atom behaves in the physical universe. (See theHSW article entitled "How Nuclear Radiation Works"for a further discussion of atoms and ...