For question number two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: a) Both A and R are true and R is correct explanation of the assertion. b) Both A and R are true but R is not the correct explanation of the assertion. c) A is true but R is false. d) A is false but R is true.
Assertion: Cathode rays consists of negatively charged particles, these are attracted towards anode (+ve terminal). Reason: Anode rays (canal rays) consists of positively charged particles and these are attracted towards cathode (-ve terminal).
Answer the following questions.
a) Describe the electronic distribution in atom of element B.
b) Is element B a metal or a non-metal why?
c) Which two elements form a pair of Isotopes.
d) Which two elements form a pair of Isobars.
write 5-6 differences between isobars and isotopes in a tabular form .
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
how to find valency of an element?
what were the drawbacks of thomson model of atom
the following data represents the distribution of electrons ,protons and neutrons in atoms of four elements A, B, C, D.
ELEMENTS PROTONS NEUTRONS ELECTRONS
A 19 21 19
B 17 18 17
C 17 20 17
D 18 22 18
Answer the following:
1. describe the electronic distribution in atom of element B.
2. is element B a metal or non-metal? why?
Calculate the number of molecules in 8g of Oxygen ?
what is the difference between sodium ion and sodium atom ?
find the valency of sulphur .[atomic no.=16
what are canal rays ?
What happens when an electron jumps from lower to higher energy levels?
5 examples of isotopes and 5 examples of isobars
What is the valency of copper?
a) What is its atomic no.?
b) State its valency
c) Identify the element.
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
Compare the properties of electrons, protons and neutrons.
what are the application of isotopes
What are the drawbacks of Rutherfords atomic model?
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
Q.1. How many molecules are present in
(a) 9 grams of water
(b) 17 grams of amonia
Q.2. Calculate the number of moles in 17 grams of H2O2
Q.3. Show that 12 grams of carbon-12 contains 6.023 x 1023 atoms of 12C
Q.4. What is the mass of one atom of hydrogen ?
Q.5. How many moles of Mg atoms are there in 100 grams of magnesium ?
Q.6. Neon gas consist of single atoms. What mass of neon contains 6.023 x 1023 atoms ?
Why is a alpha particle called helium nucleus?
difference between electrons protons and neutrons...also find the relation between the three
Who discovered proton? Golstein or Rutherford?
Q1 Tabulate name of elements,their latin names and symbols.
HCl,
H2,
H2O,
NH3,
CH3OH,
PCl5
explain the rutherford's gold foil experiment with the help of diagram?
what is electrovalency and covalency
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
why is the valency of phosphorus 3 & 5 both ?
How many sub atomic particles are there in an atom of deuterium ?
How to learn the 30 elements of modern periodic table Quickly?
a) Both A and R are true and R is correct explanation of the assertion.
b) Both A and R are true but R is not the correct explanation of the assertion.
c) A is true but R is false.
d) A is false but R is true.
Reason: Anode rays (canal rays) consists of positively charged particles and these are attracted towards cathode
(-ve terminal).
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
few statements regarding the distribution of electrons in the energy shells are given. which of the statements is not correct?
a) for the fourth shell(n),the maximum number of electrons is 32 according to 2n2rule.
b)when n is the outtermost shell of an atom, it can accommodate a maximum of 8 electrons only.
c) the filling of the fourth shell begins even before the third shell is completely filled.
d) fifth shell can accommodate 50 electrons according to 2n2 rule.
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
What is the maximum number of energy levels in an atom?
what is the valency of gold, silver and lead and can you explai how we can find the valency of a compound like NH4, SO2, CO3 etc.
calculate -
a)no. of grams-atoms of oxygen ?
b)the no. of atoms of oxygen
c)the no. of molecules of ozone in 32g of ozone (O3)
what are properties of anode rays x rays cathode rays and alpha particles
an ion M3+ contains 10 electrons and 14 neutrons.What are the atomic mass and mass number of the element M ? name the element
wht r d drawbacks of bohr's model of an atom??
they say that the red part of watermelon is proton and the seeds are electrons the area of the red part is more than the area covered by seeds how can we say that the electrons and protons are equal
Give 6 examples of isobars .........
The charge/mass ratio of electron
a) depends upon nature of gas
b) depends upon nature of electrodes
c) remains constant
d) depends upon both nature of gas and nature of electrodes
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
discovery of electrons
Calculate the percentage of
[a] Water of crystallization in CuSO4.5H2O
[B] Potassium in K2CO3
[c] Oxygen in 22g of CO2
[D] Hydrogen in 36g of water
State 3 characteristics of canal rays.
Calcualte the effective nuclear charge ( Z*) of Na+.
p.s. Don't know to which class this question would belong to!:P I'm reading it in IIT coaching!
Calculate number of neutrons present in 12 × 1025 atoms of oxygen (8O17). (Given NA = 6 × 1023 atoms)
(A) 1800 (B) 1600 (C) 1800 NA (D) 3200 NA
State two main postulates of Thomson model of an atom
applications and examples of isotopes an isobars ?
the description of atomic particles of two elements X and Y is given below:
X Y
protons 8 8
neutrons 8 9
electrons 8 8
i) what is the atomic number of Y?
ii) what is the mass number of X?
iii) what is the relation between X and Y?
iv) which element/elements do they represent?
v) write the electronic configuration of X.
vi) write the cation/anion formed by the element.
what is difference between Isotopes, Isobars and Isotones
give the atomic masses of important element for class 9
How many atoms are present in SO4 raised to 2- ion and NH4+ ion???
an element X forms an oxide with formula X2O3
rnstate the valency of X,write the formula of chloride of X and sulphate of X.
B
C
D
17
17
18
18
20
22
17
17
18
Answer the following questions.
a) Describe the electronic distribution in atom of element B.
b) Is element B a metal or a non-metal why?
c) Which two elements form a pair of Isotopes.
d) Which two elements form a pair of Isobars.
difference between isotope and isobars
1. Calculate the number of moles present in 23 g of sodium. (Atomic mass of sodium = 23)
The electronic configuration of potassium(K) is 2,8,8,1 instead of 2,8,9 thogh the M shell can accommodate up to 18 electrons. Explain
You are given an element 7X14.Find out.
a.1.number of protons,electronsneutrons in X
a.2.valency of X
a.3.electronic configuration of X.
b.If Bromine atom is available in the form of, say two isotopes
35BR79 (49.7%) 35BR82 (50.3%).
who discovered the proton? E. goldstein or rutherford?
If Z = 3, what would be the valency of the element? Also, name the element.
calculate atomic number and mass number of element y. Name the element y
write three significant features of Bohr's model of an atom.
Name three feature of rutherford's model
what are cathode rays and anode rays?
what is a difference between relative and absolute mass or charge??????????