Answer:
1.75 g
Explanation:
as density ×volume =mass
3.5×0.5=mass
mass=1.75 g
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Answer:
Explanation:
Coal is chemically complex fuel. ... The sulfur in coal combines with oxygen to form sulfur dioxide, which can be a major source of air pollution if emitted in large enough quantities. Today, many of the effects of coal burning have been reduced significantly or eliminated.
Answer:
Down syndrome can occur when a portion of chromosome 21 becomes attached (translocated) onto another chromosome, before or at conception. These children have the usual two copies of chromosome 21, but they also have additional genetic material from chromosome 21 attached to another chromosome.
1. Alpha decay
Alpha particle is
a ₂⁴He nucleus. When a parent atom emits an alpha particle, the atomic number
reduces by 2 in the formed daughter atom while reducing the mass number by 4. Since
atomic number = proton number, due to the decreasing of atomic number, proton
number also reduces by 2 in daughter nucleus.
2. Beta
emission.
There are two types
of beta decay. One is β⁻ and other one is β⁺ emission.
β⁻ emission
β⁻ emission is an emission of an electron by converting a neutron
to a proton. Hence, in β⁻<span> decay, the atomic
number increases by 1 and
mass number is not changed in the formed daughter nucleus.</span>
β⁺ emission
β⁺ emission is an emission of an positron while converting a
neutron to a proton. Hence, in β⁺ <span>decay, the atomic
number decreases by 1 and mass number is not changed in
the formed daughter nucleus.</span>
<span>
</span>
3. Gamma decay
In Gamma decay there is no any particle decay from the parent nucleus. Unstable nucleus emits energy photon and becomes as stable by undergoing a gamma decay. Hence, there is no change in atomic number or mass number of the daughter atom.
Answer:
D
Explanation:
The fact is that the both elements belong to different groups in the periodic table. Mg is in group 12 while Al is in group 13. The outer most electron configuration for Mg2+=[Ne]3s0
Al+= [Ne]3s13p0
It is evident that in Al+, the second electron is to be removed from a filled 3s subshell which is energetically unfavourable. Unlike In Mg2+ where the two electrons are removed. There is always a tendency towards a quick loss of all the valence electrons in the valence shell. It will be more difficult to remove an electron from a filled shell.