Answer:
okay lol, ima use this for points if okay
Explanation:
Answer:
it is Calcium (Ca)
4th period, 2nd group, 2 valence electrons
Answer: they help advance by being able to see clearly and being able reduce its seeing
Explanation:
Heat energy is released to warm the house
4X + 3O₂ = 2X₂O₃
n(X₂O₃)=0.02225 mol
m(X)=4.000 g
x - the molar mass of metal
m(X)/4x=n(X₂O₃)/2
x=m(X)/{2n(X₂O₃)}
x=4.000/{2*0.02225)=89.89 g/mol
X=Y (yttrium)
