Answer:
When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly
Explanation:
Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
<span>Haemoglobin is a pure substance because it contains only one type of atom. </span>
Answer:
If you mean NaCl is table salt than true
but if you mean NaC1 than false
Explanation:
