Periodic Properties and Variations of Properties - Physical and Chemical
ICSE · Class 10 · Chemistry
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Which property of atoms increases when moving down a group in the periodic table?
The modern periodic law is based on which property of elements?
The energy required to remove the most loosely bound electron from a gaseous atom is called:
Which element has the highest electronegativity among all elements?
Sample Questions
Which of the following properties generally increase across a period from left to right?
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Ionization energy, Electronegativity, Non-metallic character
Across a period, nuclear charge increases while electron shells remain same, leading to increased attraction for electrons. This increases ionization energy, electronegativity, and non-metallic character.
Elements in Group 1 (alkali metals) have how many electrons in their valence shell?
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1
All alkali metals (Group 1 elements) have one electron in their outermost shell, which they readily lose to form +1 ions.
Which of the following statements about electron affinity are correct?
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It is the energy released when an electron is added to a gaseous atom, Halogens have high electron affinity values, It generally increases across a period
Electron affinity is energy released during electron addition. Halogens readily accept electrons to complete their octet. Noble gases have stable configurations so low electron affinity.
The atomic radius of sodium (Na) is larger than that of magnesium (Mg) because:
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Magnesium has higher nuclear charge
Both Na and Mg have the same number of electron shells, but Mg has higher nuclear charge (+12) compared to Na (+11), pulling electrons more strongly and reducing atomic size.
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