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18 a) the transport food occurs through phloem
b)i)bone=skeletal tissues
I)lining of kidney tubule=epithelial tissue
17 a) j. chadwick discovered presence of neutrons in the nucleus of an atom
b)*he selected a gold foil because he wanted as thin layer as possible the gold foil was about 1000 atoms thick
*x particles are doubly charged helium ions since they have a mass of 4u
* it was expected that a particles would be deflected by the gold foil but the experiment gave unexpected results
c)isobars are atoms having same mass number but different atomic number
ex=calcium atomic no 20 ,and argon atomic no 18, the no of electrons in them is different but the mass no of both these is 40
d)Ernest Rutherford
if u like my answer plz mark me as brainiest plzz
b)i)bone=skeletal tissues
I)lining of kidney tubule=epithelial tissue
17 a) j. chadwick discovered presence of neutrons in the nucleus of an atom
b)*he selected a gold foil because he wanted as thin layer as possible the gold foil was about 1000 atoms thick
*x particles are doubly charged helium ions since they have a mass of 4u
* it was expected that a particles would be deflected by the gold foil but the experiment gave unexpected results
c)isobars are atoms having same mass number but different atomic number
ex=calcium atomic no 20 ,and argon atomic no 18, the no of electrons in them is different but the mass no of both these is 40
d)Ernest Rutherford
if u like my answer plz mark me as brainiest plzz
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