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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...
What is the number in front of an element called? Updated:10/26/2022 Wiki User ∙15yago Best Answer Copy atomic number Wiki User ∙15yago This answer is: Add your answer: Earn +20pts Q:What is the number in front of an element called? Write your answer... Submit...
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...
If an atom were about as big as a baseball stadium, the nucleus would be the size of a pea in the very center and the electrons would be somewhere on the outside edge.What makes an atom of gold different from an atom of iron is the number of protons, neutrons, and electrons inside...
What are protons, electrons, and neutrons? If the charge on the atom is 0, what does this mean? How many electrons would it take to equal the mass of a proton? What is the charge on the barium ion? What is the number of protons in hydrogen?
If the number of (b) ___ changes, the atom is of a different element. Atomic Structure: Atoms, the tiny particles that make up elements and combine to form functional molecules, are composed of three particles. Protons have a po...
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...
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 ...
One number you will find on all periodic tables is theatomic numberfor eachelement. This is the number of protons in the element, which defines its identity. How to Identify It:There isn't a standard layout for an element cell, so you need to identify the location of each important numbe...