Scelta multipla
After Mendeleev organized the periodic table by atomic weight, what major change did Henry Moseley introduce to improve its accuracy?
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2. Atoms & Elements
Periodic Table: Classifications
Scelta multipla
Which of the following elements is classified as a metal?
A
Ne (neon)
B
Si (silicon)
C
S (sulfur)
D
Na (sodium)
Guida verificata passo dopo passo1
Understand the classification of elements into metals, nonmetals, and metalloids based on their properties and position in the periodic table.
Identify the position of each element in the periodic table: Ne (neon) is a noble gas, Si (silicon) is a metalloid, S (sulfur) is a nonmetal, and Na (sodium) is an alkali metal.
Recall that metals are typically found on the left and center of the periodic table and have properties such as high electrical conductivity, malleability, and luster.
Recognize that sodium (Na) is an alkali metal located in Group 1 of the periodic table, which is characteristic of metals.
Conclude that among the given options, sodium (Na) is classified as a metal due to its position and metallic properties.
