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neutrons are found in atoms of all elements except in1 chlorine 2 oxygen 3
the nucleus of the element 21e45 contains1 45 protons and 21 neutrons 2 21 protons and 24 neutrons3 21 protons and 45 neutrons 4 24
an element has electronic configuration 2 8 18 1 if its atomic weight is 63 then how many neutrons will be present in its nucleus1
the number of electrons in the nucleus of c12 is1 6 2 12 30 43ans
the hydride ions h- are isoelectronic with1 li 2 he
co2 is isostructural with1 sncl2 2
which of the following is isoelectronic with carbon atom1 na 2 al3 3 o2-
the atomic number of an element is always equal to1atomic weight divided by 2 2number of neutrons in the nucleus 3weight of the
the ratio between the neutrons in c and si with respect to atomic masses 12 and 28 is1 2 3 2 3 2 3 3
which of the following oxides of nitrogen is isoelectronic with co21 no2 2 n2o 3
if the atomic weight of an element is 23 times that of the lightest element and it has 11 protons then it contains111 protons 23 neutrons 11
isoelectronic species are1 k cl- 2
the present atomic weight scale is based on1 c12 2 o16 3
the atomic number of an element having the valency shell electronic configuration 4s24p6 is1 35 2 36 3
number of electrons in -conh2 is1 22 2 24 3
pick out the isoelectronic structures from the following
what mass of oxygen gas exerts a pressure of 475 mm hg in a volume of 125l at a temperature of
critical anglethe particular angle of incidence at which angle of refraction becomes 90 is known as critical angle and it is denoted by
from personal experience describe whether these processes are endothermic or exothermic give a reason for each a a charcoal
three power plants have been suggested that operate at these efficienciesplantpower plant efficiency i81ii66iii41 a determine the overall
q a what is the origin of fossil fuels b list three fossil fuels c are fossil fuels a renewable resourceanswera coal
after making an ester by heating a carboxylic acid with alcohol in the presence of concentrated sulfuric acid water is added to the mixture and the
water treatment system among other process will contain the following and you are required to design only one of them and demonstrate strong
comment on each of the raw water parameters significance in relation to the selection of appropriate water treatment processsketch a flow diagram of
define enable the acquisition of powers of observationi purpose of the experimentthe purpose of the experiment is to enable the acquisition of