<span>Nickel
is an element with a mass number of 58.6934 u <u>+</u> 0.0002 u.
It has a symbol of Ni and an atomic number of 28. Nickels are usually used to
make US coins because it is a silvery-while metal. It was Axel Fredrik
Cronstedt who were said to discover Nickel in year 1751. The melting point is
Nickel is 2 651 degree F or equals to 1 455 degree C. It is also said to be
hard and ductile.</span><span>
</span>
Answer:
On the placement of hydrogen and helium in the periodic system
H1=1
He2=2
Answer:
2.33g of iron (iii) chloride
50.0 mL of 5.00 M of sodium phosphate
FeCl3 + Na3PO4 > Fe(PO4) + 3NaCl
mol = conc × vol = 0.5 × 50/1000 = 0.025 mol Na3PO4
from the equation:
1 mol of Na3PO4 reacts with 1 mol FeCl3 = 3 mol of NaCl
0.025 mol = x
x = 0.0025 × 3 = 0.075 mol NaCl
mass = 0.075 g × 59 g/mol = 4.425 g NaCl
i guessed all of this so i dont know i it is correct
Answer:
B
Explanation:
Elements in a group are determined by the number of valence electrons
Elements in a period are determined by the number of electrons shell
The electronic configuration of the element is
2,8,8
the number of valence electron is 8 that means it is in Group 8/O
the number of electron shell is 3 that means it is in period (row) 3
Group 8/O elements are called Noble gases