When the supply of air or oxygen is poor
Explanation:
Atomic number means total number of protons present in an element. Whereas mass number or atomic mass means the sum of total number of protons and neutrons in an atom or element.
When an atom is neutral then it contains same number of protons and electrons.
Symbol for any element showing atomic number and atomic mass is .
(a) the ion with a 1+ charge, atomic number 55, and mass number 133 will be Cesium and it is represented as .
(b) the ion with 54 electrons, 53 protons, and 74 neutrons will have mass number as (53 protons + 74 neutrons) = 127. Iodine is the element that has mass number 127. There will be a negative charge also as it contains 54 electrons.
Hence, symbol for this element will be .
(c) the ion with atomic number 15, mass number 31, and a 3 - charge will be phosphorous. Symbol for this element will be .
(d) the ion with 24 electrons, 30 neutrons, and a 3+ charge in elemental state will have in total 27 electrons and 30 neutrons. So, its mass number will be (27 + 30) = 57. Symbol of this element will be
Answer:
please mark me brainliesf if it is right
40 N.
Answer:
Sodium Sulphide.
Explanation:
The chemical name is sodium sulphide. The valency of the sulphide ion is 2 while the valency of sodium is 1 . That is why the molecule contains 2 sodium ions.
Answer:
Rb2CO3(aq)+Fe(C2H3O2)2(aq)--> 2Rb(C2H3O2)(aq) + FeCO3(s)
Explanation:
The reaction shown in the answer is the reaction of rubidium carbonate and iron II acetate. Rubidium is far more reducing than Fe II hence it can displace Fe II from its salt as shown.
The reducing property of metals depends on the value of their individual electrode potential values. For rubidium, its standard reduction potential is -2.98 V while that of Fe II is -0.44V. Hence rubidium can displace Fe II from its salt as shown above.