what is periodic

There are seven periods in the periodic table and each period starts with a different principal quantum number. The first period corresponding to 'n' = 1 consists of only two elements hydrogen (1s 1 ) and helium (1s 2 ). This is because the first energy shel..

The length of the menstrual cycle varies widely in women, but on an average it extends to about 28 days. It is absent during pregnancy, may be suppressed during lactation and permanently stops at menopause. The menstrual cycle is divided into 4 phases. Follicular phase or Proliferative phase Ovulat..

Seeds of apple, peach, iris would not germinate even when the conditions for germination are favourable. Such seeds germinate after they have completed a period of rest, which is called period of after ripeni..

Periodicity of Elements - The recurrence of similar properties of the elements when they are arranged in the order of increasing atomic number, after certain regular intervals, is called periodicity..

The first period has two elements - hydrogen and heliu..

Periodic Functions - The trigonometric functions belong to a large class of functions called periodic functions in which there is a regular repetition of the values of the function over a certain interv..

The size of an atom decreases and the nuclear charge increases on moving across a period. This results in greater attraction for the incoming electron. Hence the electron affinity increases in a period from left to righ..

The trigonometric functions belong to a large class of functions called periodic functions in which there is a regular repetition of the values of the function over a certain interv..

The Adolescent Period - Adolescence refers to an age between 8 to 16 years. It is a stage of human development between childhood and adultho..

Atomic radii in general, decrease with increase in atomic number, going from left to right in a period. This is explained on the basis of increasing nuclear charge along a period. The nuclear charge increases progressively by one unit while the corresponding addition of one ele..