Answer:
7 Valence Electrons.
Explanation:
The Valence electrons are referred to as the number of electrons in the outermost shell of an atom.
When given the electronic configuration, the valence can be calculated by adding the superscript of the hugest number coefficient.
The highest number coefficient in this electronc cnfiguration is 2. The sum of it's superscript is 2 (in 2s²) and 5 ( in 2p⁵). That is 2 + 5 = 7
How to test the answer?
The atom given has 9 electrons ( 2 + 2 + 5).
The K shell is being occupied by 2 electrons, the next shell; M shell which can occupy maximum of 8 electrons is being occupied by 7 electrons ( 9 - 7). And in this atom, the M shell is the outermost shell.
Answer:
Periodo: 3.
Grupo: IIA.
Explanation:
Hola.
En este caso, es posible determinar el periodo y grupo por medio de la configuración electrónica del elemento que tiene 12 electrones:
De este modo, vemos que el termino final es , por lo tanto, decimos que el periodo es 3, ya que este coincide con el nivel de energía. Adicionalmente, para tenemos que el átomo se encuentra en el grupo IIA ya que tiene dos electrones en su capa o nivel (3) más externa. Esto coincide con el número cuántico dado (magnético, ml=0) ya que cuando el término en la configuración electrónica tiene el subnivel , este tiene un valor de cero.
Así, el elemento en cuestión sería Magnesio.
¡Saludos!
Answer : The heat of the reaction is, 1.27 kJ/mole
Explanation :
First we have to calculate the heat released.
Formula used :
or,
where,
Q = heat = ?
m = mass of sample = 1.50 g
c = specific heat of water =
= initial temperature =
= final temperature =
Now put all the given value in the above formula, we get:
Now we have to calculate the heat of the reaction in kJ/mol.
where,
= enthalpy change = ?
Q = heat released = 0.0238 kJ
n = number of moles NH₄NO₃ =
Therefore, the heat of the reaction is, 1.27 kJ/mole
<span>an experiment that directly tests the hypothesis research on the topic to see what others have learned a hypothesis that is based on research and that can be tested an analysis of the responses from all of the test subjects</span>
Answer:
correct answers:
objecting to a local and consent bill
chubbing
filibuster
incorrect answers:
amending legislation
vetoing legislation
Explanation: