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Approximation
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..Discovery of Neutrons
The whole mass of an atom is due to the nucleus, which means that the nucleus must contain protons equal to the mass of the atom. As the number of protons is equal to the atomic number, the atomic mass should be equal to the atomic number. But for all atoms except hyd..
Characteristics of Electrons, Protons and Neutrons
Particle Electron Proton Neutron Symbol e p n Nature Negatively charged Positively charged Neutral Relative charge -1 +1 0 Absolute charge 1.6 x 10 -19 C 1.6 x 10 -19 C 0 Relative mass 1/1840 a,m.u 1 a.m.u 1 a.m.u Absolute..
Interaction between Colloids-Gold Number
Interaction between Colloids-Gold Number - It is known that lyophobic sols are unstable. They are however stabilized by adding stabilizers. When two lyophobic sols are mixed together, they may coagulate by mutual neutralization of electric charges or by destroying each others st..
Interaction between Colloids-Gold Number
It is known that lyophobic sols are unstable. They are however stabilized by adding stabilizers. When two lyophobic sols are mixed together, they may coagulate by mutual neutralization of electric charges or by destroying each others stabilizers. A lyophobic sol may be protected by the additi..
Nuclear Stability and Neutron/Proton Ratio
Nuclear Stability and Neutron/Proton Ratio - It has been found that the stability of nucleus depends upon its neutron to proton (n/p) ratio. A plot of N (the neutron number) against Z (atomic number or number of protons) show that for stab..
Nuclear Stability and Neutron/Proton Ratio - It has been found that the stability of nucleus depends upon its neutron to proton (n/p) ratio. A plot of N (the neutron number) against Z (atomic number or number of protons) show that for stab..Nancy had 5 gold chains. She gave 2 of them to her grand daughter. Cho..
Nancy had 5 gold chains. She gave 2 of them to her grand daughter. Choose a number sentence to find how many gold chains Nancy has left. => 5 - 3 = 4 or 5 - 2 = 3 or 5 - 2 = 2 or 5 - 3 = 1..
A bag contains 1 gold ring, 1 silver ring, and 1 diamond ring. 2 rings..
A bag contains 1 gold ring, 1 silver ring, and 1 diamond ring. 2 rings are drawn from the bag, one after the other without replacing the first ring drawn. Use the tree diagram to find the number of possible outcomes for the experiment. => 6 or 3 or 4 or 9..
The measures (in grams) of gold, silver, platinum, and copper used in ..
The measures (in grams) of gold, silver, platinum, and copper used in making an ornament are 3 1 3 , 1 3 , 0.3, 0.03. Which list shows these numbers ordered from the greatest to the least? => 0.3, 1 3 , 3 1 3 , 0.03 or 1 3 , 3 1 3 , 0.3, 0.03 or 3 1 3 , 1 3 , 0.3, 0.03 or 0.03, ..
Atomic Number, Mass Number or Nucleon Number
The nuclei of atoms are made up of protons and neutrons. These two components of the nucleus are referred to as nucleons. The electrons occupy the space outside the nucleus. Since an atom is electrically neutral, the number of protons in the nucleus is exactly equal to the ..
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