Atomic number = Mass number - Number of Neutrons. This number is the atomic number. Therefore, group number = valence shell + 10 = 5+10 = 15. Elements P, R will show similar properties as they belong to they same group with valency 1 due to same number of valance electrons. Using atomic symbols, list the elements in group 12 in order of increasing atomic mass. Sodium and cesium are both elements in Group 1. Answer the following questions giving reasons. Click here👆to get an answer to your question ️ Which of the following correctly represents the variation of electronegativity (EN) with atomic number (Z) of group 13 elements? The group 13(IIIA) elements are Boron, aluminium, gallium, indium and thallium.. 1. (a) What is the group and period number to which this element belongs? The elements in the question are as follows based on the periodic table: A=9 (Fluorine or F), B=11 (Sodium or Na), C=17 (Chlorine or Cl), D=12 (Magnesium or Mg), and E=13 (Aluminum or Al). Atomic number of the given element is 12. Silicon-based life-forms are therefore likely to be found only in science fiction. Group 13 can also be called the 3a group (that's because there are 10 electrons the transition shell). Its atomic number is 5. Justify your answer in each case. (b) Is this element a metal or a non-metal? An element ‘A’ has atomic number 11, name the period and group number to which it belongs. (ii) Write the formula of the compound formed. Atomic Mass and Atomic Number: An atom is made up of protons, electron, and neutrons. Atomic numbers of the elements are given in the parentheses:
A(4), B(9), C(14), D(19), E(20)
(i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell? (b) Molecular formula of the compound formed when 'X' reacts with an element "Y" (atomic number = 8). Justify your answer. In contrast to boron, the heavier group 13 elements form a large number of complexes in the +3 oxidation state. View solution. Visit BYJUS to learn more about it. Looking at the second period (the second row on my periodic table), my periodic table says the element there is B, or Boron. The periodic table lists the elements in order of increasing atomic number. Check the below NCERT MCQ Questions for Class 10 Science Chapter 5 Periodic Classification of Elements with Answers Pdf free download. In Groups 13-18, the number of electrons in Np sublevel equals group number minus 12 Write the outer electron configuration for the Group 15 element in the fourth period. Group 13 elements - The Boron family . It is in group 18 of the periodic table and is a noble gas. If atomic number of carbon is 6, the atomic number of silicon is (a) 7 (b) 14 (c ... 13. in the outer shell of all the elements in a group is the same as the group number. 13. however, cesium reacts more violently in water than sodium. (a) Since the atomic number given = 13 The Electronic configuration of the element=2,8,3 (b) Group number to which the element 'X' belongs = 10 +3 = 13th group. (c) Since 'X' has 3 valence electrons. 11.1 GROUP 13 ELEMENTS: THE BORON FAMILY This group elements show a wide variation in properties. So it belongs to 1st group ∴The element with atomic number 19 belongs to 4th period and I group. None of the group 13 elements reacts directly with hydrogen, and the stability of the hydrides prepared by other routes decreases as we go down the group. Groups are numbered from 1 to 18. Learn more about groups in this article. Periodic Table of Elements - The periodic table is a very useful listing of all 118 elements by symbol, atomic number, and atomic mass and molecular mass. Atomic number of a few elements are given below 10,20,7,14 (a) Identify the elements (b) Identify the Group number of these elements in the Periodic Table (c) ... and S have atomic numbers 12, 13, 14 and 15 respectively. Elements with similar chemical properties are called groups. down the group.. Reason: The number of shells occupied with electrons increases down the group. So far it has been prepared (Atomic numbers are given in the brackets) N (7), Be (4), Ar (18), Cl (17) Answer: a. If you're seeing this message, it means we're having … Examples. If there is a second letter, it is lowercase. Group 17 elements: Trend of change in the physical properties: The atomic radius (atomic size) of the halogens increases gradually. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. An element has atomic number 13. Group-13 or IIIA Elements. asked Mar 29, 2019 in Chemistry by Farrah ( 69.5k points) periodic classification of elements Because E=E and E≡E bonds become weaker with increasing atomic number (where E is any group 14 element), simple silicon, germanium, and tin analogues of alkenes, alkynes, and aromatic hydrocarbons are either unstable (Si=Si and Ge=Ge) or unknown. [Ar] 4s^2 3d^10 4p^3 In order to find out the group to which the element belongs, we need to know the atomic number of the element. Group-13 or IIIA contains five elements, Boron (B), Aluminum (Al), Gallium (Ge), Indium (In), Thallium (Tl) with valence shell electron configuration nS 2 nP 1. Oganesson has an atomic number of 118, which represents the number of protons it contains in its nucleus. c. To which period does this element belong? An element X (atomic number 17) combines with an element Y (atomic number 20) to form a compound. Argon is a chemical element with the symbol Ar and atomic number 18. The chemical symbol for Aluminum is Al. The element is large and has an atomic mass of 294 AMU. Once we know the atomic number of the element, the electronic configuration and valency can be determined. So, 'x' is a metal. Electronic configuration of element A (5) = 2,3 Therefore, group number = valence shell + 10 = 3+10 = 13. (d) The formula for the bromide can be calculate by cross multiplication of the valences which is as follows: (b) It is a metal because it can lose 3 electrons to become stable. None of the group 13 elements reacts directly with hydrogen, and the stability of the hydrides prepared by other routes decreases as we go down the group. All the Group 1 elements - lithium (Li), sodium … Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. (i) Write the positions of these elements in the modern periodic table. The no. Question 16. Silicon belongs to the third period and Group 14.

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