The number of protons in an atom of any given element is always the same. Physicists call this the atomic number. So, in the above example of lead, its atomic number is 82 and that does not change; if it did, it would be a different element (thallium, atomic number 81, or bismuth...
A. the number of protons in an atom B. the number of neutrons in an atom C. the number of electrons in an atom D. the total number of particles in an atom 相关知识点: 试题来源: 解析 A。元素的原子序数告诉我们一个原子中的质子数。原子序数等于质子数,选项 B 中子数不能由原子序数确定...
atomic mass. For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater. Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element. All the isotopes of a given element have the same number of proton...
1.Or proton number (Z) The number of protons in the nucleus of an atom. If not electrically charged, this is equal to the number of electrons in its shells. 2.The number of protons in the nucleus of an atom. Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagra...
The number of protons in an atom equals the number of electrons. This is necessary to balance the charge of an atom, and to increase its stability... See full answer below.Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our exp...
31. In every atom in its normal state, the number of protons equals the number of electrons, something which is directly related to the electrical properties of the proton and the electron. 相关知识点: 试题来源: 解析 【答案】在每个原子的正常状态下,质子的数量等于电子的数量,这与质子和 电...
MALE PROFESSOR: And it's arranged according to increasing atomic number, which is … ? FEMALE STUDENT: The number of protons in each atom of an element. MALE PROFESSOR: Right.Well, early versions of the periodic table had gaps. Missing elements.Every time you have one more proton you have...
The graph shows a decrease in atomic radii of period 3 elements across the period. ·Across the period,the atomic radii decrease .This is because the number of protons (the nuclear charge) and the number of electrons increases by one every time you go an element to the right. ...
Describe the structure of an atom.An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons determines
B. Atom has a small positively charged nucleus surrounded by a large region in which there are enough electrons to make the atom neutral. Atom – Nucleus Makes up about 99% of the atomic mass A. Protons – Positive charge (1) The number of protons determines what the element is. (2) ...