Atomic number of someelementsaregiven. `A-15, B-8, C-11,D-18, E-20.F-34, G -10`: Which are the elementsin sameperiod?

Atomic number of someelementsaregiven. A-15, B-8, C-11,D-18, E-20.F-34, G -10 : Which are the elements in same group?

Symbols (not real symbols) of some atoms are given. 8^17P , 18^40Q , 16^8P , 20^40R Find the atomic number and mass number of these elements.

Symbols (not real symbols) of some.atoms are given. underset(8) overset (17) \P ,underset(18) overset (40) \ Q, underset(8) overset (16) \R a) Find the atomic number and mass number of these elements. b) Which among these are isotopic pairs? c) Draw the Bohr model of atom Q.

The mass number of an element is 23 and its atomic number is 11 a) Find the number of electrons. b) Find the number of neutrons. c) Write the electronic configuration.

Number of binary operations on the set {a, b} are (A) 10 (B) 16 (C)20 (D) 8

Examine the samples given. a) 20g He b) 44.8 L of NH_3 at STP c) 67.2 L N_2 at STP d) 1 mole of H_2 SO_4 e) 180g of water i) Arrange the samples in the increasing order of the number of molecules in each. ii) What will be the ascending order of the number of atoms? iii) What will be the mass of samples b,c, and d?

Bohr models of atoms A, B,C,D are given (Symbols are not real). a) Write the atomic number, mâss number and electronic configuration of the atoms. b) Among these, which are isotopes? Why?

56g Nitrogen is taken (Atomic mass: N=14) a) Calculate the number of moles in it. b) Find the number of molecuels. c) How many atoms are present in it?

The projection of a line segment on the axes are 9, 12 and 8. Then, the length of the line segment is a)15 b)16 c)17 d)18