The neutral Helium atom is made of a nucleus (containing two
protons and two neutrons) and two electrons. The electrons have an
average separation from the nucleus of r =31pm. Note: 1pm
= 10-12m (pico-meter)
Consider the average configuration of the Helium atom shown above,
treating the nucleus as a single charge of the appropriate size.
What is the magnitude of the total electric force acting on one of
the electrons?
A helium nucleus (called an alpha particle) contains 2 neutrons
and 2 protons with no electrons. If any electrons are added, there
is a negligible amount of mass added but obviously one negative
charge per electron is added. Three particles are injected into a
constant B-field of 2T at a velocity of
3×106ms. The first
particle is only the alpha particle
(He++), the second particle is a nucleus
with 1 electron (He+), and the third
particle is a nucleus with...
An atom has 20 neutrons and 19 protons in its nucleus. How many
electrons are in its outer (valence) electron shell? How many
shells does it have? What is its atomic mass in g/mol? What is the
element?
1, 3, 39, K
1, 4, 19, Mg
2, 4, 19, Mg
2, 4, 39, K
1, 4, 39, K
Considering an atom with 48 protons and 64
neutrons: A. name the element B. What
is the atomic numberC. what is the mass number? D. How many
electrons in the atom?E. Which, if any of A, B, C, or D change if
the atom has 65 electrons?
Problem 10.23
An alpha particle (a helium nucleus, containing 2 protons and 2
neutrons) starts out with kinetic energy of 10.0 MeV (10.0 ×
106 eV), and heads in the +x direction straight toward a
gold nucleus (containing 79 protons and 118 neutrons). The
particles are initially far apart, and the gold nucleus is
initially at rest. Answer the following questions about the
collision.
What is the initial momentum of the alpha particle? (You may assume
its speed is small...
Protons, Neutrons, Electrons1) how many protons neutrons and electrons are there in
sulfur.2) How many protons neutrons and electrons are there in
magnesium3) How many protons are there in the nitrogen ion (N-3)4) How many protons neutrons and electrons are there in the
chlorine ion (Cl-)5) What is the atomic number of a neutral Atom with 35
electrons? what element isthis?6) True or false: an element with 35 protons and 38 electrons is
a neutral element.7) How many electrons does...
the table below gives the numbers of electrons, protons and
neutrons in atoms or ions of several elements. Please note that the
letters in the Table are not element symbols.
Atom or Ion of Element
A
B
C
D
E
F
G
H
# of electrons
9
1
18
18
1
10
82
10
# of protons
9
1
19
17
1
8
82
11
# of neutrons
10
1
20
18
2
8
125
12
Select all that are...