Read the following lines written about the modern periodic table and fill in the blanks: I am the Modern Periodic table, where elements are arranged on the basis of …………………….. .I have ……………….. Horizontal rows called ………………… and ………………….. Vertical columns are called …………………… My firs period is very short with ……………… elements and 2 and 3 periods contain …………….. Elements. 4 and 5 has ……………………… elements. 6 period has …………………… elements but 7 period is …………………… . With space for more elements. 17 group is of ……………….. 18 is of ……………. . Atomic size of my elements ………………………..​

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12