<u>Answer:</u>
By 1700, 13 elements had been discovered and isolated by the Scientists.
Option (a)
<u>Explanation:</u>
- The copper, gold and silver are the elements which have been known from thousands of years. In the early days of 1700, the scientist discovered only 12 elements, later on one more element was discovered.
- Later in the era of 1800, the scientist research and find new elements, where they organize it methodically, according to the physical and chemical properties.
- After a long research in 1900 scientist discovered more than 80 elements.
Uhhh i think it might be c blue because it has more volume and less amount of matter
NaN₃ is the chemical formula for Sodium Azide
Answer:
The farther it is the weaker the forces gets.
Explanation:
Take a magnet as a example, if it's close it will attract, but if it's far away then it cannot attract.
Answer:
D. the sea of electrons
Explanation:
Metallic bonds are defined as the bonds formed between two or more metals. Silver atom form metallic bond with other silver atoms.
In metallic bond, the free electrons or valence electrons present in s and p orbitals delocalize. The valence electrons do not move around the atoms or enter the atoms whereas they form a sea of electrons in which they surround the nuclei (positively charged) of the metal ions interacting. The valence electrons are then freely move in the space between the atomic nuclei.
Hence, the correct answer is "D. the sea of electrons".