define periodic time
Answers
Answer:
fundamental measure, fundamental quantity - one of the four quantities that are the basis of systems of measurement
test period, trial period - a period of time during which someone or something is tested
time frame - a time period during which something occurs or is expected to occur; "an agreement can be reached in a reasonably short time frame"
hours - an indefinite period of time; "they talked for hours"
downtime - a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions)
uptime - a period of time when something (as a machine or factory) is functioning and available for use
work time - a time period when you are required to work
time off - a time period when you are not required to work; "he requested time off to attend his grandmother's funeral"
bout - a period of illness; "a bout of fever"; "a bout of depression"
hospitalization - a period of time when you are confined to a hospital; "now they try to shorten the patient's hospitalization"
travel time - a period of time spent traveling; "workers were not paid for their travel time between home and factory"
times - a more or less definite period of time now or previously present; "it was a sign of the times"
time - an indefinite period (usually marked by specific attributes or activities); "he waited a long time"; "the time of year for planting"; "he was a great actor in his time"
elapsed time - the time that elapses while some event is occurring
duration, continuance - the period of time during which something continues
calendar week, week - a period of seven consecutive days starting on Sunday
midweek - the middle of a week
field day - a time of unusual pleasure and success
lifespan, lifetime, life-time, life - the period during which something is functional (as between birth and death); "the battery had a short life"; "he lived a long and happy life"
life - the period between birth and the present time; "I have known him all his life"
life - the period from the present until death; "he appointed himself emperor for life"
millennium, millenary - a span of 1000 years
bimillenary, bimillennium - a span of 2000 years
occupation - the period of time during which a place or position or nation is occupied; "during the German occupation of Paris"
past - a earlier period in someone's life (especially one that they have reason to keep secret); "reporters dug into the candidate's past"
shelf life - the length of time a packaged food or drug will last without deteriorating
puerperium - time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved; "a perinatologist cared for her during the puerperium"
lactation - the period following birth during which milk is secreted; "lactation normally continues until weaning"
time of life - a period of time during which a person is normally in a particular life state
calendar day, civil day - a day reckoned from midnight to midnight
festival - a day or period of time set aside for feasting and celebration
daylight, daytime, day - the time after sunrise and before sunset while it is light outside; "the dawn turned night into day"; "it is easier to make the repairs in the daytime"
forenoon, morn, morning, morning time - the time period between dawn and noon; "I spent the morning running errands"
night, nighttime, dark - the time after sunset and before sunrise while it is dark outside
night - the time between sunset and midnight; "he watched television every night"
night - the period spent sleeping; "I had a restless night"
night - a period of ignorance or backwardness or gloom
eve - the period immediately before something; "on the eve of the French Revolution"
evening - the early part of night (from dinner until bedtime) spent in a special way; "an evening at the opera"
hebdomad, week - any period of seven consecutive days; "it rained for a week"
fortnight, two weeks - a period of fourteen consecutive days; "most major tennis tournaments last a fortnight"
weekend - a time period usually extending from Friday night through Sunday; more loosely defined as any period of successive days including one and only one Sunday
Indian summer, Saint Martin's summer - a period of unusually warm weather in the autumn
year - the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; "a Martian year takes 687 of our days"
schooltime, school day, school - the period of instruction in a school; the time period when school is in session; "stay after school"; "he didn't miss a single day of school"; "when the school day was done we would walk home together"
What is periodic time ?
The trend of similar properties that are observed in elements, when arranged or positioned with increasing order of atomic number called periodicity.
What are the causes ?
The cause for the periodicity is the valence electrons of elements. Valence electrons influence the properties of elements. When elements are arranged in the order of increasing atomic number, then elements with same number of valence electrons are grouped together. Members of same group have same electronic configuration and hence same valency. Thus, members of a group show similar chemical properties, because of which they show periodicity
What are examples ?
Example: rising of sun every morning is a periodic
Example: rotateing the earth around sun is a periodic