31, 31, 40. An atom of _31^71Ga has 31 electrons, 31 protons, and
40 neutrons.
The atomic number is 31, so the atom has<em> </em>31 protons (+).
If the atom is neutral, it must contain 31 electrons (-).
Mass number = protons + neutrons or
A = p + n
71 = 31 + n
n = 71- 31 = 40 neutrons
Answer:
4.52×10^24
Explanation:
N = n × Na
where; N = no. of bananas
n = no. of moles
Na = Avogadro's constant
Which is 6.02×10^23
N = 7.5 × 6.02×10^23
N =4.515×10^24
Let the unknow oxidation number b x
1+x+3(-2)=0
x-5=0
x=5
Answer: The ocean is made mostly of: D) Hydrogen and oxygen.
Explanation: The most abundant elements in the ocean by proportion of mass in percent are oxygen (85.84%), hydrogen (10.82%), chlorine (1.94%), sodium (1.08%), magnesium (0.13%), sulfur (0.09%), calcium (0.04%), potassium (0.04%), bromine (0.007%), carbon (0.003%), and boron (0.0004%).
Hope this helped!