Tin, because it has five energy levels with four electrons in the fifth level
.
Explanation:
Tin has an electronic configuration as
1s2,2s2,2p6,3s2,...........4d10, 5s2,5p2
They have four valence electrons in their outer shell
Among the four diagrams given Tin is least reactive because the atomic radius of tin is largest among all four options. Due to large atomic radius electronegativity decreases and hence Tin is the least reactive element among Neon, Chlorine, gallium and tin.
The electronegativity of an element is its tendency to complete its octet by attracting electrons towards itself. Also tin is at the lowest place in the periodic table among all the four mentioned elements, its ionization energy is also low hence less electronegative and least reactive.
Answer:
1.All living things are composed of cells.
2.Cells are the basic units of structure and function for living things.
3.All cells come from pre-existing cells. Also, organisms grow by “adding on more cells” NOT by increasing the size of their cells.
They can harm other native species and thrive in the new environment which can potentially make the other species go extinct as the new species has no predators.
Answer:
Option A
Explanation:
The test which determines the percentage of erythrocytes or red blood cells (RBC's) in the total blood sample of an individual is known as the hematocrit blood test. The measurements for hematocrit test are usually taken by volume. It is a very basic test conducted as per prescription of physician to understand the health of an individual
Anemia results when the results of hematocrit blood test are extremely low.
Hence, option A is correct
