A. The number of protons B. The number of neutrons C. The number of electrons D. The sum of protons and neutrons 相关知识点: 试题来源: 解析 A。原子序数由质子数决定。选项 A 正确,原子序数等于质子数。选项 B 中子数不能决定原子序数。选项 C 电子数在原子呈电中性时等于质子数,但不是决定原...
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What number of protons and neutrons are contained in the nucleus of (41)(20) Ca? Assuming the atom is uncharged, what number of electrons are present?What number of protons and neutrons are contained in the nucleus of (86)(37) Rb? Assuming the atom is uncharged, what numbe...
If the number of in an atom is changed, it is no longer the same element. a) proton b) neutron c) electron Two atoms of the same element with the same number of protons, but different numbers of neutrons are called (a) __...
Protons have arelative massof 1, which is the same as the relative mass of neutrons. Thenumber of protons in an atomis called the 'Atomic Number' of that atom and is sometimes referred to as 'Z'. This is important because itdefines the type of atom, i.e. whichelementit is an atom...
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.
What is the center of an atom called?Atoms:Atoms are the smallest indivisible working unit of matter. It is composed of three subatomic particles: neutrons, electrons, and protons. Neutrons are neutrally charged whereas electrons are negatively charged. Protons are the subatomic particles of an ...
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An atom of a given element always has the same number of protons. If it had a different number, it would be a different element. However, atoms of the same element can have different numbers of neutrons. Each version is called an isotope of that element, and each isotope has a different...
Atoms are the purest form of matter. They consist of protons, neutrons, and electrons. The periodic table lists all of the different types of atoms that are known to exist and are known as elements. Answer and Explanation: An atom that has more protons than electrons is called a cation. ...