The meaning of ATOMIC NUMBER is an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines t
The atomic number corresponds to the number of protons in the nucleus of an atom of that element. It also corresponds to the number of electrons in the neutral atom.050100Atomic number/www.webelements.com H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn ...
题目The periodic table is arranged in order of increasing ___. A. atomic number B. atomic weight C. density D. melting point 相关知识点: 试题来源: 解析 B。原因:文中提到“Mendeleev arranged the elements in order of increasing atomic weight.”。 反馈 收藏 ...
atomic number, the number of achemical elementin the periodic system and on theperiodic tablethat equals the number of protons in the nucleus of the atom. The elements are arranged on the table in order of increasing number of protons in the nucleus. Accordingly, the number ofprotons, which...
Why is it called a periodic table? When Dmitri Mendeleev drew up the periodic table, he grouped elements of similar properties. Based on the number of electrons, a scientist can determine which group to place an element into.This pattern is called a period(or row) on the periodic table. ...
State the name of the element with atomic number 20. What is the name and symbol of the element that has an atomic number of 11 and 12 neutrons? How many electrons does a neutral atom of this element have? On the periodic table, what are elements from the 7A(17)...
Journal of Chemical EducationEbel, R.L. (1938). Atomic structure and the periodic table.J. Chem. Educ., 15, 575 - 577.Ebel, R. I. Atomic structure and the periodic table. Journal of Chemical Education, 15, p. 575-7, 1938.
4 The Periodic Table consists of elements arranged in order of increasing atomic number.(a)(i) What is meant by the term atomic number?(1) A the number of neutrons in an atom B the number of protons in an atom C the number of protons plus the number of electrons in an atom D the...
Calderglen High School 9. What is ATOMIC NUMBER? answer The number of protons in an atom. It is the number by which elements are arranged in the Periodic Table Calderglen High School Why are atoms electrically neutral? 10. answer The number of positively charged protons equals the number of...
is the element that isatomic number2 on the periodic table. Each helium atom has 2protonsin its atomic nucleus. The atomic weight of the element is 4.0026. Helium does not readily form compounds, so it is known in its pure form as a gas. ...