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andreev551 [17]
2 years ago
13

I need help in science

Chemistry
1 answer:
astraxan [27]2 years ago
7 0
The answer is D . I hope this help you :) .
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Which of these elements is this group?
sergey [27]

Answer:

Strontium

Explanation:

In the periodic table, an element with two (2) valence electrons is found on group 2. Group 2 is a group of the periodic table that harbors element called ALKALINE EARTH METALS. As the name implies, they are metals that possess shiny and solid characteristics at room temperature.

Group 2 elements include the following: Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), barium (Ba), and radium (Ra). Based on the descriptive information in this question, the element being described is a GROUP 2 element. Based on the elements in the option, only STRONTIUM (Sr) is a group 2 element.

3 0
3 years ago
Which of the following is a single replacement reaction?
Morgarella [4.7K]

Fe + 3NaBr → FeBr3 + 3Na

The Na is replaced by the Fe atom.

4 0
3 years ago
Read 2 more answers
1. Calculate the energy of a photon with a frequency of 3x1015 Hz.<br> ?????
Afina-wow [57]

Answer:

1.99 x 10⁻¹⁸J

Explanation:

Given parameters:

Frequency of the wave  = 3 x 10¹⁵Hz

Unknown:

Energy of the photon  = ?

Solution:

To solve this problem, we use the expression below;

     E  = hf

Where E is the energy, h is the Planck's constant and f is the frequency

Now insert the parameters and solve for E;

     E  = 6.63 x 10⁻³⁴ x 3 x 10¹⁵ = 19.9 x 10⁻¹⁹J or 1.99 x 10⁻¹⁸J

6 0
3 years ago
I need help with this question please asap I would really appreciate it
yanalaym [24]

Answer:

I think c

Explanation:

4 0
3 years ago
1. Identify the reactants in this chemical equation:<br> 2H2 + O2 + 2H2O
USPshnik [31]
Oxygen and hydrogen
6 0
3 years ago
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