1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Complete the sentences. Choose answers from the box. Each word may be used once, more than once, or not at all.

Geiger and Marsden's alpha particle scattering experiment showed that the major mass and positive charge of an atom is concentrated in the ____________________.
The negatively charged particle orbiting the central region of the atom is the ____________________.
The subatomic particle located inside the central core that has no electrical charge is the ____________________.
The atomic number of an element is determined solely by its number of this positive particle: the ____________________.
If a neutral atom loses or gains electrons, it becomes a charged particle called an ____________________.

[5]

Table 1 shows information about two isotopes of element $Y\text{Y}$ .

	Mass number	Percentage (%) abundance
Isotope 1	20	90
Isotope 2	22	10

Calculate the relative atomic mass ( $A_r$ ) of element $Y\text{Y}$ using the equation:

A_r = \frac{(\text{mass number} \times \text{percentage}) \text{ of isotope 1} + (\text{mass number} \times \text{percentage}) \text{ of isotope 2}}{100}

Give your answer to 1 decimal place.

[2]

Suggest the identity of element $Y\text{Y}$ . Use the periodic table.

[1]

The radius of an atom of element $Y\text{Y}$ is $1.5 \times 10^{-10}\text{ m}$ .

The radius of the centre of the atom is $000\frac{1}{20\,000}$ of the radius of the atom.

Calculate the radius of the centre of an atom of element $Y\text{Y}$ . Give your answer in standard form.

[2]

Complete the sentences. Choose answers from the box. Each word may be used once, more than once, or not at all.

Geiger and Marsden's alpha particle scattering experiment showed that the major mass and positive charge of an atom is concentrated in the ____________________.
The negatively charged particle orbiting the central region of the atom is the ____________________.
The subatomic particle located inside the central core that has no electrical charge is the ____________________.
The atomic number of an element is determined solely by its number of this positive particle: the ____________________.
If a neutral atom loses or gains electrons, it becomes a charged particle called an ____________________.

Mass number

Percentage (%) abundance

Isotope 1

Isotope 2

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions