Concept of education

/which concept in dalton’s atomic theory has been modificated in modern models

atoms connot subdivided

/neon-22 contains 12 neutrons. Its also contains

10 pro

/as the mass number of an element’s isotopes increase, the number of protons

remains the same

/thomson’s experiment with cathode rays led to the discovery of the

electrons

/what is the molar mass of ethyl alcohol, C2H5OH

46.08

/Most of the volume of an atoms is occupied by the

electrons

/an aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

27

/dalton incorporated the law of conservation of mass into his atomic theory by asserting that

atoms are very small

/what is the molar mass of oxygen, o2

32

/what is the numbers of atoms of hydrogen present in pb

12

/the average atomic mass of an element

is approximately the mass

/an atom has no charge when

the numbers electrons and neutrons are equal

/what is the molar mass of (NH4)2SO4

132.17

/According to the law of definite proportions, any two samples of the compound CH4 have

the same ratio

/chlorine has atomic number 17 and mass number 35. It has

17p,17e,18neu

/because a few alpha particles bounced back from the gold foil, rutherford concluded that

the nucleus is a

/a substance with 17 protons 18 electrons and 18 neutrons will form

positive

/all atoms of the same elements have the same

numbers of neutrons

/which part of an atom has a mass approximately equal to zero

electrons

/carbon-14 the radioactive nuclide used in dating fossils has

8 neutrons

/the nucleus of an atom has all of the following characteristics except that it

contains   volume

/what is the number of atoms of H present in (NH4)2SO4

8

/an atom that has the same number of protons than another, but has different number of neutrons, is called its

isotope