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Tpy6a [65]
3 years ago
8

Each element has a unique number of ____, called the atomic number. since an atom is neutral this number is also equal to the nu

mber of _____ present
Chemistry
1 answer:
Tju [1.3M]3 years ago
8 0
1.) protons
2.)electrons
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How many moles of oxygen molecule is reacting with sodium according to the following reaction:
murzikaleks [220]

<u>1 mole of oxygen.</u>

Answer:

solution given:

2Na+O_2=Na_2O_2\\2mole\:\: 1mole \:\: 1mole

according to the above reaction,1 mole of oxygen is required to react with 2 moles of sodium to form sodium peroxide.

Explanation:

6 0
2 years ago
What is an alkali metal with fewer than 10 protons in its nucleus?
Trava [24]

Answer:

            Lithium

Explanation:

                  Alkali metals are group of metals which are present in first group of periodic table. As we know atomic number is equal to number of protons contained by a particular element. Therefore, the alkali metals along with there number of protons are listed below;

Alkali Metal                                         Number of Protons

Lithium                                                               3

Sodium                                                             11

Potassium                                                         19

Rubidium                                                         37

Cesium                                                             55

Francium                                                          87

Hence, it is cleared from above table that Lithium is having fewer protons than 10.

6 0
3 years ago
Which of the following statements is true of vibrations? A. The frequency of infrasonic vibrations is much too high to be heard
Wewaii [24]

D. ( Neither ultrasonic nor infrasonic vibrations can be heard by humans. )

4 0
3 years ago
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A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine
Anna71 [15]
I think it’s 40% but I’m not sure
6 0
3 years ago
How many miles are in 62 grams of copper (ll) nitrate
grandymaker [24]
Did you mean moles? Instead of miles

If so it’s 0. 330568289543697
8 0
4 years ago
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