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NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements - Learn CBSE

Compare and find. One such column is Li, K, Na. It was applicable up to calcium. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above.

K is in group 1. Therefore, the oxide will be K 2 O. C is in group 4. Therefore, the oxide will be CO 2. Al is in group 3. Therefore, the oxide will be Al 2 O 3. Si is in group 4. Therefore, the oxide will be SiO 2. Ba is in group 2. Therefore, the oxide will be BaO. Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table?

Mendeleev used atomic mass of the elements as the unique criteria of the elements. He proposed that the chemical properties of elements are the periodic function of their atomic masses. And thus, he arranged the elements in the increasing order of their atomic class 10th chemistry chapter 5 ncert solutions china. Noble gases are inert elements.

Their properties are different from the all other elements. Therefore, the noble gases are placed in a separate group. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?

Calcium Ca and strontium Sr are expected to show chemical reactions similar to magnesium Mg. This is because the number of valence electrons 2 is same in all these three elements and since chemical properties are due to valence electrons, they show same chemical reactions. Name a three elements that have a single electron in their outermost shells. Is there any similarity in the atoms of these elements? What, if anything, do their atoms have in common?

The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell. By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?

Since Be lies to the extreme left hand side of the periodic table, Be is the most metallic among the given elements. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table. Element X forms a chloride with the formula XCl 2which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as a Na.

Which element has a two shells, both of which are completely filled with electrons? An atom has electronic configuration 2, 8, 7. Atomic numbers are given in parentheses. Nitrogen atomic number 7 and phosphorus atomic number 15 belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Since, electronegativity decreases with moving from top to bottom in a group, thus Nitrogen will be more electronegative.

How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?

In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the. Elements across a period show an increase in class 10th chemistry chapter 5 ncert solutions china number of valence electrons. In the Modern Periodic Table, calcium atomic number 20 is surrounded by elements with atomic numbers 12, 19, 21, and Which of these have physical and chemical properties resembling calcium?

The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons 2. Your class 10th chemistry chapter 5 ncert solutions china address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. Groups for Noble gas was not present as noble gases were not discovered by that time.

This problem has been rectified as slots are determined according to atomic number. Add a Comment Cancel reply Your email address will class 10th chemistry chapter 5 ncert solutions china be published.

This is called rusting of iron. Which of these have physical and chemical properties resembling calcium? This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals. The black coloured compound is copper oxide CuO. Answer: Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. Question 3 Identify the substances that are oxidised and the substances which are reduced in the following reactions.

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