3Pb(s) + 2H3PO4(l) →

The correct option is .

Further explanation:

The periodic properties are characteristics that are associated with the different elements found in the periodic table. The origin of different properties is the difference in the atomic structure of the different elements.

For a systematic study of the chemical and physical properties of different elements, they are placed in certain columns called groups and horizontal rows called periods.

The fundamental basis of this arrangement is periodic law that states that chemical elements must be listed in order of their increasing atomic number. When elements are placed in groups in such order it was observed that elements with similar chemical properties repeated after fixed intervals, this was discovered by the Russian scientist Mendeleev. For example, the elements placed in group 1 that included lithium, sodium, potassium, and cesium all reacted vigorously with water. Similarly, the elements in group 17 were termed as halogens as they all readily formed salts with metals of group 1.

The rows of the table called periods and have metals on the left and non-metals on the right. The columns also called groups contains elements with similar chemical properties.

Metals are very good reducing agents that have a high tendency to lose electrons. Their electronegativity is very low. Metals also form cations smaller than an original metal atom. They mostly form an ionic bond.

The properties that identify the metal can be determined by the following:

1. Electronic configuration: A metal generally has 1, 2 or 3valence electrons in its outermost shell.

2. Physical properties: A metal is generally lustrous, hard, malleable, ductile, and solid. It is a good conductor of heat and electricity.

3. Position in the periodic table: Metals are on the bottom left in the periodic table. They are found in group 1 of periodic table.

Therefore, an element is metal is determined by the position of an element in periodic table.

Learn more

1. Which type of bond formed between water brainly.com/question/1059245

2. Intermolecular forces of attraction brainly.com/question/6717479

Answer details

Grade: High School

Subject: Chemistry

Chapter: Periodic table

Keywords: electron, metals, nonmetals, group, period, position, electronic configuration, oxygen, hard, lustrous, element.

Answer : The number of moles of hydrogen gas needed are, 0.253 mole

Explanation : Given,

Moles of water = 0.253 mole

Now we have to calculate the moles of hydrogen gas.

The given balanced chemical reaction is,

From the balanced reaction we conclude that,

As, 2 moles of water obtained from 2 moles of hydrogen gas

So, 0.253 moles of water obtained from of hydrogen gas

Therefore, the number of moles of hydrogen gas needed are, 0.253 mole

Answer:

Explanation:

Alkanes are saturated hydrocarbons with only single bonds of carbon and hydrogen.