Concept explainers
Interpretation: The elements that possess properties similar to the given element, chlorine should be determined.
Concept Introduction:
Periodic Table: The available chemical elements are arranged considering their
In periodic table the horizontal rows are called periods and the vertical column are called group. There are seven periods and 18 groups present in the table and some of those groups are given special name as follows,
Atomic Number: Atomic number of the element is equal to the number of protons present in the nucleus of the element which is denoted by symbol Z. The superscript presents on the left side of the
Electronic configuration: It is used to denote the distribution of electrons placed over orbitals that present in the atom.
The rules followed by the electrons are as follows,
The electrons gets distributed starting from lower energy orbital to higher energy orbital, pairing of electrons starts after all the orbitals are singly filled and finally, no two electrons that have same spin can occupy the same orbital.
In periodic table the horizontal rows are called periods and the vertical column are called group.
Cation: Removal of electron from the atom results to form positively charged ion called cation.
Anion: Addition of electron to atom results to form negatively charged ion called anion.
The net charge present in the element denotes the presence or absence of electrons in the element.
Metalloid (semi-metal): The chemical element is considered as metalloid if it contains properties of both metals and the non-metals.
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CHEM: ATOM FIRST V. 1 W/ACCESS >C<
- Which of the following are isotopes of element X, the atomic number for which is 9: 919X, 920X, 189X, and 921X?arrow_forward2.40 What distinguished the work of Mendeleev that caused scientists to accept his concept of the periodic table when others before him were not believed?arrow_forward2.42 What is a period in the periodic table? From what does it derive its name?arrow_forward
- What evidence led to the conclusion that cathode rays had a negative charge?arrow_forwardLittle is known about the properties of astatine, At, becauseof its rarity and high radioactivity. Nevertheless, it is possiblefor us to make many predictions about its properties. (a) Doyou expect the element to be a gas, liquid, or solid at roomtemperature? Explain. (b) Would you expect At to be a metal,nonmetal, or metalloid? Explain. (c) What is the chemicalformula of the compound it forms with Na?arrow_forward2. An element which has a shiny lustre, is bendable, and is a good conductor of heat and electricity can be classified as: metal, noble gas, non metal or metaloid?arrow_forward
- (a) Are the elements calcium, barium, and radium in the same group or same period in the periodic table? (b) Are the elements rhodium, cadmium, and tin in the same group or period?arrow_forwardEnter the appropriate symbol for an isotope of phosphorus-32 corresponding to the isotope notation AZX.arrow_forwardDefine the term an element?arrow_forward
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