The nucleus of the isotope bismuth 211 was obtained. Composition of the atomic nucleus

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The number of particles that make up an atomic nucleus is called mass number and is denoted by A. The number of protons in the nucleus is called the charge number. The number of particles that make up the atomic nucleus
is called the mass number and is denoted by A.
The number of protons in the nucleus is called the charge
number and is denoted by Z.
The number of neutrons included in the nucleus
denoted by N.
A=N+Z

Determine the total number of particles that make up the atomic nucleus of magnesium, of which how many protons and neutrons there will be, respectively.

Symbol
Number
particles in
core
Number
protons in
core
24
12
25
12
26
12
Number
neutrons in
core

Isotopes are varieties of a given chemical element that differ in the mass of atomic nuclei.

Alpha decay

Offset rule:
214
84
4
Po 210
82 Pb 2 He
During the alpha decay of a chemical

which is located in the table
D.I. Mendeleev is two cells closer to
its beginning than the original one.

4
2
He
alpha particle
(nucleus of a helium atom)
- characteristic of radioactive elements with
serial number greater than 83
.- the conservation law is necessarily satisfied
mass and charge number.

A
z
X Y e
0
1
A
z 1
0
1
0
0
e - symbol - particles

Offset rule

239
93
Np Pu e
239
94
0
1
0
0
During the beta decay of one chemical
element is formed by another element,
which is located in the table
D.I. Mendeleev in the next cell behind
original (i.e. one cell closer to
end of the table).

0
1
e
beta particle (electron)
- often accompanied by gamma radiation.
- may be accompanied by education
antineutrino
(light electrically neutral particles,
having great penetrating
ability).
- the law must be followed
conservation of mass and charge number.

Determine the missing element:

Fill the table:

Name Symbol
substances
helium
Cu
Mass Charge Number
number, A number, Z neutrons,
N
4
64
7
germanium
3
32
20
F
41
10
10

Write the alpha decay reaction

Write the alpha decay reaction
207
82
Pb
108
47
Ag
64
29
Cu

Write down the reaction for beta decay:

e
O
e
Write down the reaction for beta decay:
16
8
79
34
O
Se
200
80
Hg
79
34
200
80
Se
Hg
226
88
Ra
200
80
226
88
Ra
235
92
U

Problem solving

1. Determine the nucleus of which chemical
element formed from carbon-14
a result of beta decay.
2. The nucleus of the isotope bismuth-211 was obtained from
another nucleus after alpha and beta decays. What kind of core is this?
3. How many alpha and beta decays
occurs as a result of transformation
radium-226 to lead-206?