The tabular arrangment of elements in horizontal rows and vertical columns……………….

Transition elements show horizontal as well as vertical relationship.

Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic charcter of elements very on moving down a vertical column ? How does the size of atomic radius vary on moving left to right in a horizontal row ? Give reason in pupport of your answer in the above two cases.

The arrangement of elements in a group of three was done by Döbereiner.

Horizontal rows of periodic table are called

Let A be nxxn matrix given by A=[(a_(11),a_(12),a_(13)……a_(1n)),(a_(21),a_(22),a_(23)…a_(2n)),(vdots, vdots, vdots),(a_(n1),a_(n2),a_(n3).a_("nn"))] Such that each horizontal row is arithmetic progression and each vertical column is a geometrical progression. It is known that each column in geometric progression have the same common ratio. Given that a_(24)=1,a_(42)=1/8 and a_(43)=3/16 Let d_(i) be the common difference of the elements in with row then sum_(i=1)^(n)d_(i) is

The letters of the word EQUATION are arranged in a row. Find the probability that arrangements start with a vowel and end with a consonant.

The elements given below are arranged in order of increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K This arrangement of elements is an illustrator of which law of classification of elements.

The mixture of a pure liquid and a solution in a along vertical column (i.e., horizontal dimensions lt lt vertical dimensions) produces diffusion of solute particles and hence a refractive index gradient along the vertical dimension. A ray of light entering the column at right angles to the vertical is deviated from its original path. Find the deviation in travelling a horizontal distance d lt lt h , the height of the column.

Two dimensional close packed structure can be generated by stacking the rows of close packed spheres. This can be done in two different ways. (I) The second row may be placed in contact with the first one, such that the spheres of the second row are exactly above those of first row. The spheres of the two rows are aligned vertically as well as horizontally. If we call the first row as 'A' type of row, the second row being exactly same as the first one is also of 'A' type. Similarly, we may place more rows to obtain AAAA.... type arrangement (II) In this type, the second row may be placed above the first one in a staggered manner such that its spheres. fit in depressions of first row. if the arrangement of spheres in the first row is called 'A' type the one in the second row is different and may be called 'B' type. When the third row is placed adjacent to the second in staggered manner, its spheres are aligned with those of first layer. Hence this layer is also 'A' type. The spheres of similarly placed fourth row will be aligned with those of the second row ('B' type). Hence this arrangement is of ABAB.... type The type of voids generated in type (I) & (II) respectively are