Rewrite the following statements after correction, if necessary:(a) Groups have elements with consecutive atomic numbers.
(b) Periods are the horizontal rows of elements.
(c) Isotopes are the elements of the same group.
(a) Periods have elements with consecutive atomic numbers.
(b) The statement "Periods are the horizontal rows of elements" is correct.
(c) The statement "Isotopes are the elements of the same group" is correct.
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- State whether the following statement are true or false:(a) Newlands divided the elements into horizontal rows of eight element each. (b) According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers. (c) The elements in a group have consecutive atomic numbers.
- Rewrite the following statements after correction, if necessary:(i) Elements in the same period have equal valency (ii) The metallic character of elements in a period increases gradually on moving from left to right.
- The atomic numbers of three elements A, B, and C are given below:Element Atomic number
- 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) Identify the Periods of these elements in the Periodic Table(d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements.
- (a)What are the periods and groups in a periodic table? Give two characteristics of each.(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group. (c) Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr: Li Be Na --- K --- Rb --- Cs --- Fr Ra (i) What happens to the size of atoms? (ii) What happens to their metallic character? (d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change? (e) Rewrite the following statement after correction, if necessary: Groups have elements with consecutive atomic numbers.
- Fill in the following blanks with suitable words:(a) The basis for modern periodic table is ______. (b) The horizontal rows in a periodic table are called ______. (c) Group 1 elements are called ______. (d) Group 17 elements are known as ______. (e) Group 18 elements are called ______. (f) According to Newlands’ classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the ______ element starting from oxygen.
- Which of the following statement is correct in regard to the classification of elements ?(a) Elements in the periodic table are arranged on the basis of increasing atomic masses (b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers (c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass (d) In modern periodic table, the isotopes of chlorine having diffrenet atomic masses are kept in the same group.
- (a) What is meant by (i) a group, and (ii) a period, in a periodic table?(b) How many periods and groups are there in the long form of periodic table? (c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.
- The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.(i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.
- The atomic radii of the first group elements are given below :Group-I elementAtomic Radii (pm)Na86K231Rb244Cs282State the reason behind the observed trend in the above elements.
- Isotopes of an element have(a) the same physical properties(b)the same chemical properties(c)different number of neutrons(d) different atomic numbers.
- (a) Explain why:(i) All the elements of a group have similar chemical properties. (ii) All the elements of a period have different chemical properties. (b) The atomic radii of three elements X, Y, and Z of a period of the periodic table are 186 pm; 104 pm, and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.
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- What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
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