GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lithium and Carbon
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Hydrogen and Neon
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Helium and Chlorine
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Hydrogen and Helium
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Detailed explanation-1: -In the beginning, or at least following the Big Bang more than 14 billion years ago, there was hydrogen, some helium and a little bit of lithium.
Detailed explanation-2: -The first elements-hydrogen and helium-couldn’t form until the universe had cooled enough to allow their nuclei to capture electrons (right), about 380, 000 years after the Big Bang.
Detailed explanation-3: -Row one of the periodic table is inhabited by just two elements-hydrogen and helium. These two were among the first elements created during the birth of our universe. They are the source material for the formation of nearly all other elements, and they are the most abundant elements in our universe even today.
Detailed explanation-4: -Together, helium and hydrogen make up 99.9 percent of known matter in the universe, according to Encyclopedia.com.
Detailed explanation-5: -Hydrogen and helium atoms emerged a measly 379, 000 years after the Big Bang. As the hot, dense plasma of protons, electrons and photons that was the universe began to cool and expand, electrons and protons gathered to form atoms.