GROWTH DEVELOPMENT CHILD
FORMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3
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4
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2
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5
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Detailed explanation-1: -Hence, there are 8 elements in period 2 of the periodic table.
Detailed explanation-2: -Lithium, atomic number 3 begins the second period, which has 8 elements.
Detailed explanation-3: -Beryllium(2+) is a monoatomic dication, a beryllium cation and a divalent metal cation. Beryllium is a light-weight metallic element, which was first recognized as a lung hazard in Europe in the 1930s, shortly after its first production in modern industry.
Detailed explanation-4: -The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells.
Detailed explanation-5: -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.