Question 1

How are elements arranged in the Periodic Table according to the Edexcel Lower Secondary Science curriculum?

Accepted Answer

In the Edexcel Lower Secondary Science curriculum, elements in the Periodic Table are arranged by increasing atomic number, which is the number of protons in an atom's nucleus. The table is organized into rows called periods and columns known as groups, with elements in the same group having similar chemical properties.

Question 2

What are the characteristics of Group 1 elements in the Periodic Table?

Accepted Answer

Group 1 elements, also known as alkali metals, include lithium, sodium, potassium, rubidium, cesium, and francium. They are characterized by having one electron in their outermost shell, making them highly reactive, especially with water. These elements are soft, have low melting points, and are good conductors of electricity.

Question 3

Why are Group 1 elements highly reactive?

Accepted Answer

Group 1 elements are highly reactive because they have a single electron in their outermost shell. This electron is easily lost in chemical reactions, allowing these elements to achieve a stable electron configuration similar to noble gases. Their reactivity increases down the group as the outer electron is further from the nucleus and more easily removed.

Question 4

What trends can be observed in the properties of Group 1 elements?

Accepted Answer

In Group 1 elements, several trends can be observed as you move down the group: reactivity increases, melting and boiling points decrease, and the density generally increases. These trends are due to the increasing atomic size and the decreasing attraction between the outer electron and the nucleus.

Question 5

How does the Periodic Table help in predicting the properties of elements?

Accepted Answer

The Periodic Table helps predict the properties of elements by organizing them into groups and periods based on their atomic structure. Elements in the same group have similar chemical properties due to having the same number of electrons in their outer shell. This arrangement allows scientists and students to infer the behavior and characteristics of elements based on their position in the table.

Periodic Table – Arrangement of elements and Group 1 elements

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