What type of rock is the wave made of?
Answer: The Wave is a natural formation of ~sandstone rocks~
The Answer is the Mendeleev left several blanks in the periodic table for the elements that had yet to be discovered.
Periodic table is an arrangement of chemical elements in a table made up of rows and columns, rows are called periods and columns are known as groups.
In 1869, Dimitri Mendeleev who was a Russian Chemist published first organized periodic table.
In a chemical reaction mass is neither created nor destroyed
Na2SO4 is neutral
AlCl3 can be both acid and a base
Li3PO4 is acid
<u>Answer:</u>
d. Transition metal
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<u>Explanation:</u>
A transition metal is an element which has an atom or forms an ion with a partially-filled d-subshell.
As we can see from the electronic configuration of Copper 2+ ion, Cu²⁺:
,
copper forms an ion with an incomplete d-subshell that contains 9 electrons; therefore copper is a transition metal.
• Option a. is wrong because copper is not a metalloid. Metalloids have characteristics of both metals and non-metals; copper only has metallic properties.
• Option b. is wrong because 'alkaline earth metals' are the elements in Group 2 of the periodic table; copper is in Group 11.
• Option c. is wrong because 'alkali metals' are in Group 1 of the periodic table.