Atomic Size Increases Down Group
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The document is about the periodic table and properties of elements. It contains questions about: - How the modern periodic table improved upon Mendeleev's table by eliminating anomalies. - Identifying metals, nonmetals, and metalloids among the first 20 elements. - Defining atomic size and how it varies within periods and groups. - Predicting properties of element X based on its atomic number of 17. - Calculating valency from electronic configuration and explaining trends in the periodic table.
![OMTEX CLASSES SCIENCE AND TECHNOLOGY
SCHOOL OF ELEMENTS
FILL IN THE BLANKS
MATCH THE COLUMN
DEFINE
GIVE SCIENTIFIC REASONS [Textual]
Atomic size increases down the group
Metallic character decreases from left to right in a period
Elements in the same group show the same valency
GIVE SCIENTIFIC REASONS [Non Textual]
Chlorine is placed in VII A group in the modern periodic table.
Metallic character decreases across a period.
Group VII A elements are strong non-metals and group I A elements are
strong metals.
Non-metallic character increases across a period.
Atomic size decreases across a period.
The family of noble gases is called as zero group.
Valency varies gradually across a period.](https://image.slidesharecdn.com/schoolofelements-140814015036-phpapp02/85/school-of-elements-1-320.jpg)
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Atomic Size Increases Down Group
- 1. OMTEX CLASSES SCIENCE AND TECHNOLOGY SCHOOL OF ELEMENTS FILL IN THE BLANKS MATCH THE COLUMN DEFINE GIVE SCIENTIFIC REASONS [Textual] Atomic size increases down the group Metallic character decreases from left to right in a period Elements in the same group show the same valency GIVE SCIENTIFIC REASONS [Non Textual] Chlorine is placed in VII A group in the modern periodic table. Metallic character decreases across a period. Group VII A elements are strong non-metals and group I A elements are strong metals. Non-metallic character increases across a period. Atomic size decreases across a period. The family of noble gases is called as zero group. Valency varies gradually across a period.
- 2. OMTEX CLASSES SCIENCE AND TECHNOLOGY ANSWER THE FOLLOWING How could the modern periodic table remove various anomalies of Mendeleev's periodic table? In modern periodic table, which are the metals, non metals and metalloids among the first 20 elements? What are the demerits of Mendeleev's Periodic table? Define atomic size. How does it vary in a period and in a group? Name three elements The atomic number of an element X is 17. Predict : Read the following descriptions and decide whether the element belongs to metal or non-metal. Justify your answer. How do you calculate valency of an element from its electronic configuration ? What should be the position of Hydrogen in the Modern Periodic Table ? Why? How are isotopes of different elements placed in the Modern Periodic Table ? Why is atomic number said to be a fundamental property? Explain the features of Mendeleev's periodic table.
- 3. OMTEX CLASSES SCIENCE AND TECHNOLOGY Explain the zig-zag line in the periodic table. Explain the modern periodic table. Explain Newlands law of octaves giving examples.