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The elements with the smallest atomic radii are found in the top of the P block of the Periodic Table. Helium (He) has the smallest atomic radius. Francium, on the other side of the periodic table (very bottom of the S block), has the largest atomic radius.
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What factor determines the focal length of a lens?
It is determined by the radii of curvature of its two faces.
What determines the focal length of two sides of a lens?
Their radii of curvature and the refractive index of the material of the lens.
How many neutrons are in Se?
Since Selenium has an atomic number of 34, it has 34 protons and electrons at its elemental resting state. The most common isotopes have 44 and 46 neutrons, which you get from subtracting the atomic number from the atomic mass.
What is the focal length of sunglasses?
The focal length of a Sunglass lens is theoretically infinite. It is because the radii of curvatures of the front and back surfaces are equal.
Why does the reactivity increase down the group 7?
The reactivity decreases down group 7. Group 7 elements have 7 valence electrons (electrons on the very last electronic shell), so this means it need to attract one electron (because its harder to lose 7 than attract 1) to attain stable electronic configuration of 8 electrons. Now because atomic radii decreases down a group, the nucleus is further away from the electrons, and the further away they are, the lower the force of attraction, making it harder to form a bond, meaning, they react less readily. Volia! Reactivity decreases down group 7. This is also the reason why reactivity increases down group 1 Because there is 1 valence electron, it needs to lose 1 electron to attain stable electronic configuration (because its harder to attract 7 than lose 1) and because the atomic radii decreases down a group (this rule is constant through the entire periodic table) the attraction is weaker, so its easier to lose 1 electron, making it easier for group 1 to bond, meaning, they react more readily.
Where are atoms with the largest and smallest atomic radii found?
The atoms with the largest atomic radii are found in the lower right side of the periodic table. Smallest atoms are found in the higher left part of the periodic table. He has the smallest atomic radii.
What elements has the smallest atomic size K Ca Na Ar or Kr?
Ar, using the table of atomic radii in wikipedia.
What group of elements have members of the smallest atomic radii for a given period?
Noble gases have the smallest atomic radius.
Of the following which has smallest atomic radius sulfur aluminum sodium barium?
Atomic radii become larger as you go from top to bottom of the periodic chart, but they get smaller as you go from left to right. Therefore, the elements with the smallest radii are in the upper right hand corner. Of S, Al, Na, and Ba, sulfur is the closest to the upper right corner and has the smallest radius of those elements.
Why are the ionic radii of metallic elements smaller than the atomic radii of the same elements?
The ionic radii of metallic elements is smaller than its atomic radii, because the ion has less electrons. This gives it a smaller electron cloud and makes the atom smaller.
Which atom has the smallest atomic radii?
Fluorine has the smallest atomic radii because it is towards the right of the periodic table and on top.
How can you find out the atomic radii?
Look for a reference chart in a book or online. Look for a Periodic Table of the Elements that has the atomic radii on it.
Why do halogens have the smallest atomic radii in their respective periods?
Halogens have maximum effective nuclear charge. So the high number of protons in the nucleus attract electrons and thus the size of the atomic radii is the smallest.
What happens to the atomic radii of the elements as a group is descended?
As we descend down the group, the atomic radii increases. This is because the number of shells increases.
What is the change in atomic radii for the elements in period 2?
Seventeen
Is atomic radii of d block elements is smaller than p block reason out?
Comparing d-block elements with s & p-block elements, it does have smaller atomic radii because of the richness in electrons & protons.
What is the relationship between the atomic numbers and ionic radii of the elements in the group 3A?
I think that the ionic radii decrease
