Answer:
B
Explanation:
triple beam balance
sorry if i am wrong! can be brainliest?
<span>Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.
</span>Mendeleev rewrote each edition of Principles of Chemistry<span>, including all new scientific data-particularly confirmations of the periodic law-and reanalyzing difficulties that had arisen to hinder its confirmation (inert gases, radioactivity, radioactive and </span>rare-earth elements<span>)
</span>he wanted to prove that he was right.
You are right, it's CA Calcium, 40.08, Group 2 and Row 4.
Answer:
What element is this. Would you mind inserting a picture or naming the element in the comments section
I think it is rarefaction. But im not sure