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The atomic sizes increases down the group , this is because new shells are being added as we go down the group this increases the distance between the outermost electrons and the nucleus so that atomic size increases inspite of the increase in nuclear charge
(1)The tendency of metals to lose electrons inorder to get stability is called electropositive nature of metals. In general most of the metals lose electrons from their valence shell due to weak force of attraction on the outermost shell.
Metalloids can be defined as the elements show intermediate properties of metal and non-metals. All known elements can be classified as metals, nonmetals and metalloids. Here metals are shiny hard conducting elements whereas non-metals are mainly found in liquid or gaseous state. They are insulators of heat and electricity.
Two examples of metalloids:
So, these elements exhibit intermediate properties of both types of elements
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(1) Atomic size decreases across a peroid from left to right as we face the table but increases down a group,a column of the perodic table and thus across the peroid necular charge predominates,and draws the valence electrons towards the necular core,with the result of a marked decreased in atomic rules
1. Atomic size DECREASES along the group. This may sound weird because the atomic number increases along the group, put due to a larger number is electrons in the valence shell and a larger number of protons in the nucleus, the valence shell is closer to the nucleus due to the increases electrostatic force of attraction between protons and the valence electrons.
2. Metals have less electrons in their valence shells and losing them uses less energy than gaining many electrons to complete their octet. For example a potassium atom has 1 valence electron so it can easily lose it but gaining 7 electrons takes up a lot of energy. When it loses electrons, the positive charge increases in comparison, and this is why metals are said to be electro positive in nature.
3. Metalloids are substances which show characteristics of both metals and non metals. eg they may be sonorous and lustrous like metals but form anions like non metals. Eg. silicon, germanium etc.
because they easily lose the electrons in the outermost shell
because their electronic configuration is in the way that their valence shell has less than 4 electrons . as a result they lose e- and become electropositive
because they lose electrons...
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helium third Balancer
metals lose valence electrons from their valence shell due to the weak force of attraction on the outermost shell
therefore metals are electropositive
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the critical field resistance is defined as the maximum field circuit resistance (for a given speed) with the shunt generator would excite. the shunt generator will build up voltage only if field circuit resistance is less than critical field resistance.