The top number on elements in the periodic table is the atomic number, so when you look at the periodic table you can see that 42 is Mo (Molybdenum), and this is the only element with that atomic number.
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Ionic substances formed from complete transfer of electrons from one atom to another causing electrostatic attraction
It was found that atoms are made up of even smaller particles (through experiments), and the models changed because how we thought atoms were composed turned out to be wrong, and corrections were made accordingly.
Answer:
Explanation:
Basically in metallic bonds, valence electrons are not localied which means they can freely move from one atom to another. Thus, they move in "sea of electrons" because in a sea water or waves are freely moving without any localization.
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The bombing on the cities of Hiroshima and Nagasaki is an example of negatively affecting science.
Answer: A
Explanation
The stream of science in education system was included to understand the working of nature, organisms and day today life mechanisms in a logical way.
Then science is used to invent new things , to understand the magic of science in creating wonders.
The researchers have invented new things in science so that they can be useful for human kind.
But as it is said, every advantages comes with its own disadvantages.
Alfred Nobel was the first person to invent dynamite and when he lost his younger brother during experimenting the use of dynamite, he himself quoted that he by mistake have invented a monster for human kind.
This statement became very true when US used TNT or dynamite in the first nuclear attack made in the history of world.
The US have used this nuclear weapon on Hiroshima and Nagasaki in Japan killing lakhs of civilians due to injury and radiation.
Even now the radiation is still affecting the citizens in those two cities.
It is cited as one of the most negative affect of science on the human kind.
