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Why does the fourth period in the periodic table contain 18 elements?
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4. Atoms and Elements
Periodic Table: Element Symbols
Scelta multipla
Which element has 56 protons in its nucleus?
A
Barium (Ba)
B
Cesium (Cs)
C
Lanthanum (La)
D
Strontium (Sr)
Guida verificata passo dopo passo1
Recall that the number of protons in the nucleus of an atom is called the atomic number, which uniquely identifies an element.
Look up the atomic numbers of the given elements: Cesium (Cs), Lanthanum (La), Strontium (Sr), and Barium (Ba).
Compare each element's atomic number to the given number of protons, which is 56.
Identify the element whose atomic number matches 56, meaning it has 56 protons in its nucleus.
Confirm that this element is Barium (Ba), as it has the atomic number 56.
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