Question

A alone can do a peace of work in 7 days and B alone can do the work in 8 days . if both of them work together, how long will they take to complete the work ?  A 48/11 B 56 days C 56/15 days D none of these PLEASE TELL​

Answer 1

Vanadium is 3 rd transition metal . It show hard, malleable , ductility properties .it is form wire . It is present in earth curst in the form of rock oil, iron rock and phosphorous rock .it show anti corrosion properties . It is 1st element present in 5 th group . It is rarely found earth metal

Discovery : vanadium is discovered by 2 times First time it is discovered in 1801 by scientist Andres maueldel Raw in Mexico City Second time it is discovered by scientists Nil Gabrief selfstrom in 1830. He was found vanadium element from iron made ore it is an oxide form

Origin of name :. The name vanadium is derived from word ‘ vandis’

The meaning of this word is goodness beauty . I.e. Multi colour chemical element

Physical properties :

1) Atomic symbol: vanadium is denoted by symbol V

2) Atomic number : atomic number of vanadium is 23 In vanadium 23 proton and 23 electron is present

3) Atomic weight/ mass: atomic weight of vanadium is 50.94 amu In vanadium atom nucleus 23 proton, 28 neutron is present Sum of proton and neutrons gives atomic mass

4) Position :. It is place in 4th row ( period) and 5th column ( group ) It is 5 th group element

5) Block : it is place in d block

6) Colour : it is silver colour element

7) Odour : it is odourless metal

8) Nature :. It is found in nature at solid state

9) Boiling point : boiling point of vanadium is 34070 C

10) Melting point : melting point of vanadium is 19100 C

11) Isotopes: Vanadium show 2 stable isotope

50V: atomic weight of this isotope is 49.9 amu In this isotope 23 proton ,23 electron and 28 neutron is present. It is present 0.25% present

51V: Atomic weight of this isotope is 50.9 amu

In This isotope 23 proton,23 neutron and 28 neutron is present It is present 99.7% Other 3 radio active isotopes is present 48V ,49V, 52V

Answer 2

Answer:

PROCESS BY WHICH GREEN PLANTS MAKE FOOD IS CALLED PHOTOSYNTHESIS EXPLANATION

Explanation:

U R SO SCARED OF JINIYA U CHANGED UR PFP WITHOUT EVEN TELLING

.U r not the 1st person who said im older then 14 •_•"

.I DONT HAVE ANY BUT I GOT MSG EACH N EVERY DAY IN FEB ETC ETC.

.LEMME ASK U A QUE CAN I??